Remove lowres video decoding

This feature is complex, of questionable utility, and slows down
normal decoding.

Signed-off-by: Mans Rullgard <mans@mansr.com>

34 files changed, 56 insertions, 755 deletions

diff --git a/avconv.c b/avconv.c
index a43a6f8ea3..6c3e6a9838 100644
--- a/avconv.c
+++ b/avconv.c
@@ -3527,12 +3527,6 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
 
         switch (dec->codec_type) {
         case AVMEDIA_TYPE_VIDEO:
-            if (dec->lowres) {
-                dec->flags |= CODEC_FLAG_EMU_EDGE;
-                dec->height >>= dec->lowres;
-                dec->width  >>= dec->lowres;
-            }
-
             ist->resample_height  = dec->height;
             ist->resample_width   = dec->width;
             ist->resample_pix_fmt = dec->pix_fmt;
diff --git a/avplay.c b/avplay.c
index e9388fd4b8..0d72f466f9 100644
--- a/avplay.c
+++ b/avplay.c
@@ -244,7 +244,6 @@ static int step = 0;
 static int workaround_bugs = 1;
 static int fast = 0;
 static int genpts = 0;
-static int lowres = 0;
 static int idct = FF_IDCT_AUTO;
 static enum AVDiscard skip_frame       = AVDISCARD_DEFAULT;
 static enum AVDiscard skip_idct        = AVDISCARD_DEFAULT;
@@ -1298,7 +1297,7 @@ static void alloc_picture(void *opaque)
         /* SDL allocates a buffer smaller than requested if the video
          * overlay hardware is unable to support the requested size. */
         fprintf(stderr, "Error: the video system does not support an image\n"
-                        "size of %dx%d pixels. Try using -lowres or -vf \"scale=w:h\"\n"
+                        "size of %dx%d pixels. Try using -vf \"scale=w:h\"\n"
                         "to reduce the image size.\n", vp->width, vp->height );
         do_exit();
     }
@@ -2185,14 +2184,12 @@ static int stream_component_open(VideoState *is, int stream_index)
     avctx->debug_mv          = debug_mv;
     avctx->debug             = debug;
     avctx->workaround_bugs   = workaround_bugs;
-    avctx->lowres            = lowres;
     avctx->idct_algo         = idct;
     avctx->skip_frame        = skip_frame;
     avctx->skip_idct         = skip_idct;
     avctx->skip_loop_filter  = skip_loop_filter;
     avctx->error_concealment = error_concealment;
 
-    if (lowres) avctx->flags  |= CODEC_FLAG_EMU_EDGE;
     if (fast)   avctx->flags2 |= CODEC_FLAG2_FAST;
 
     if (!av_dict_get(opts, "threads", NULL, 0))
@@ -2979,7 +2976,6 @@ static const OptionDef options[] = {
     { "fast", OPT_BOOL | OPT_EXPERT, { (void*)&fast }, "non spec compliant optimizations", "" },
     { "genpts", OPT_BOOL | OPT_EXPERT, { (void*)&genpts }, "generate pts", "" },
     { "drp", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&decoder_reorder_pts }, "let decoder reorder pts 0=off 1=on -1=auto", ""},
-    { "lowres", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&lowres }, "", "" },
     { "skiploop", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&skip_loop_filter }, "", "" },
     { "skipframe", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&skip_frame }, "", "" },
     { "skipidct", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&skip_idct }, "", "" },
diff --git a/libavcodec/alpha/dsputil_alpha.c b/libavcodec/alpha/dsputil_alpha.c
index dc7cef9356..ce7cecb741 100644
--- a/libavcodec/alpha/dsputil_alpha.c
+++ b/libavcodec/alpha/dsputil_alpha.c
@@ -336,7 +336,7 @@ void ff_dsputil_init_alpha(DSPContext* c, AVCodecContext *avctx)
     put_pixels_clamped_axp_p = c->put_pixels_clamped;
     add_pixels_clamped_axp_p = c->add_pixels_clamped;
 
-    if (!avctx->lowres && avctx->bits_per_raw_sample <= 8 &&
+    if (avctx->bits_per_raw_sample <= 8 &&
         (avctx->idct_algo == FF_IDCT_AUTO ||
          avctx->idct_algo == FF_IDCT_SIMPLEALPHA)) {
         c->idct_put = ff_simple_idct_put_axp;
diff --git a/libavcodec/arm/dsputil_init_arm.c b/libavcodec/arm/dsputil_init_arm.c
index 21e1351e16..bc94b08d2a 100644
--- a/libavcodec/arm/dsputil_init_arm.c
+++ b/libavcodec/arm/dsputil_init_arm.c
@@ -80,7 +80,7 @@ void ff_dsputil_init_arm(DSPContext* c, AVCodecContext *avctx)
     ff_put_pixels_clamped = c->put_pixels_clamped;
     ff_add_pixels_clamped = c->add_pixels_clamped;
 
-    if (!avctx->lowres && avctx->bits_per_raw_sample <= 8) {
+    if (avctx->bits_per_raw_sample <= 8) {
         if(avctx->idct_algo == FF_IDCT_AUTO ||
            avctx->idct_algo == FF_IDCT_ARM){
             c->idct_put              = j_rev_dct_arm_put;
diff --git a/libavcodec/arm/dsputil_init_armv5te.c b/libavcodec/arm/dsputil_init_armv5te.c
index d74ca424b9..f37ffc3e9c 100644
--- a/libavcodec/arm/dsputil_init_armv5te.c
+++ b/libavcodec/arm/dsputil_init_armv5te.c
@@ -29,7 +29,7 @@ void ff_prefetch_arm(void *mem, int stride, int h);
 
 av_cold void ff_dsputil_init_armv5te(DSPContext *c, AVCodecContext *avctx)
 {
-    if (!avctx->lowres && avctx->bits_per_raw_sample <= 8 &&
+    if (avctx->bits_per_raw_sample <= 8 &&
         (avctx->idct_algo == FF_IDCT_AUTO ||
          avctx->idct_algo == FF_IDCT_SIMPLEARMV5TE)) {
         c->idct_put              = ff_simple_idct_put_armv5te;
diff --git a/libavcodec/arm/dsputil_init_armv6.c b/libavcodec/arm/dsputil_init_armv6.c
index aa6de3f7a7..fbe601408c 100644
--- a/libavcodec/arm/dsputil_init_armv6.c
+++ b/libavcodec/arm/dsputil_init_armv6.c
@@ -74,7 +74,7 @@ av_cold void ff_dsputil_init_armv6(DSPContext *c, AVCodecContext *avctx)
 {
     const int high_bit_depth = avctx->bits_per_raw_sample > 8;
 
-    if (!avctx->lowres && avctx->bits_per_raw_sample <= 8 &&
+    if (avctx->bits_per_raw_sample <= 8 &&
         (avctx->idct_algo == FF_IDCT_AUTO ||
          avctx->idct_algo == FF_IDCT_SIMPLEARMV6)) {
         c->idct_put              = ff_simple_idct_put_armv6;
diff --git a/libavcodec/arm/dsputil_init_neon.c b/libavcodec/arm/dsputil_init_neon.c
index b2931fe525..d3ef85048f 100644
--- a/libavcodec/arm/dsputil_init_neon.c
+++ b/libavcodec/arm/dsputil_init_neon.c
@@ -182,7 +182,7 @@ void ff_dsputil_init_neon(DSPContext *c, AVCodecContext *avctx)
 {
     const int high_bit_depth = avctx->bits_per_raw_sample > 8;
 
-    if (!avctx->lowres && avctx->bits_per_raw_sample <= 8) {
+    if (avctx->bits_per_raw_sample <= 8) {
         if (avctx->idct_algo == FF_IDCT_AUTO ||
             avctx->idct_algo == FF_IDCT_SIMPLENEON) {
             c->idct_put              = ff_simple_idct_put_neon;
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 9e937d31b1..0fda1cb26d 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1394,7 +1394,7 @@ typedef struct AVCodecContext {
     int width, height;
 
     /**
-     * Bitstream width / height, may be different from width/height if lowres enabled.
+     * Bitstream width / height, may be different from width/height.
      * - encoding: unused
      * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
      */
@@ -2586,7 +2586,7 @@ typedef struct AVCodecContext {
      * - encoding: unused
      * - decoding: Set by user.
      */
-     int lowres;
+    attribute_deprecated int lowres;
 
     /**
      * the picture in the bitstream
@@ -2847,7 +2847,7 @@ typedef struct AVCodec {
     const int *supported_samplerates;       ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
     const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
     const uint64_t *channel_layouts;         ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
-    uint8_t max_lowres;                     ///< maximum value for lowres supported by the decoder
+    attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
     const AVClass *priv_class;              ///< AVClass for the private context
     const AVProfile *profiles;              ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
 
diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index bcd6c24843..62485b4f75 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -2700,37 +2700,6 @@ static void ff_jref_idct_add(uint8_t *dest, int line_size, DCTELEM *block)
     ff_add_pixels_clamped_c(block, dest, line_size);
 }
 
-static void ff_jref_idct4_put(uint8_t *dest, int line_size, DCTELEM *block)
-{
-    ff_j_rev_dct4 (block);
-    put_pixels_clamped4_c(block, dest, line_size);
-}
-static void ff_jref_idct4_add(uint8_t *dest, int line_size, DCTELEM *block)
-{
-    ff_j_rev_dct4 (block);
-    add_pixels_clamped4_c(block, dest, line_size);
-}
-
-static void ff_jref_idct2_put(uint8_t *dest, int line_size, DCTELEM *block)
-{
-    ff_j_rev_dct2 (block);
-    put_pixels_clamped2_c(block, dest, line_size);
-}
-static void ff_jref_idct2_add(uint8_t *dest, int line_size, DCTELEM *block)
-{
-    ff_j_rev_dct2 (block);
-    add_pixels_clamped2_c(block, dest, line_size);
-}
-
-static void ff_jref_idct1_put(uint8_t *dest, int line_size, DCTELEM *block)
-{
-    dest[0] = av_clip_uint8((block[0] + 4)>>3);
-}
-static void ff_jref_idct1_add(uint8_t *dest, int line_size, DCTELEM *block)
-{
-    dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
-}
-
 static void just_return(void *mem av_unused, int stride av_unused, int h av_unused) { return; }
 
 /* init static data */
@@ -2797,28 +2766,12 @@ av_cold void ff_dsputil_init(DSPContext* c, AVCodecContext *avctx)
     }
 #endif //CONFIG_ENCODERS
 
-    if(avctx->lowres==1){
-        c->idct_put= ff_jref_idct4_put;
-        c->idct_add= ff_jref_idct4_add;
-        c->idct    = ff_j_rev_dct4;
-        c->idct_permutation_type= FF_NO_IDCT_PERM;
-    }else if(avctx->lowres==2){
-        c->idct_put= ff_jref_idct2_put;
-        c->idct_add= ff_jref_idct2_add;
-        c->idct    = ff_j_rev_dct2;
-        c->idct_permutation_type= FF_NO_IDCT_PERM;
-    }else if(avctx->lowres==3){
-        c->idct_put= ff_jref_idct1_put;
-        c->idct_add= ff_jref_idct1_add;
-        c->idct    = ff_j_rev_dct1;
-        c->idct_permutation_type= FF_NO_IDCT_PERM;
-    }else{
-        if (avctx->bits_per_raw_sample == 10) {
-            c->idct_put              = ff_simple_idct_put_10;
-            c->idct_add              = ff_simple_idct_add_10;
-            c->idct                  = ff_simple_idct_10;
-            c->idct_permutation_type = FF_NO_IDCT_PERM;
-        } else {
+    if (avctx->bits_per_raw_sample == 10) {
+        c->idct_put              = ff_simple_idct_put_10;
+        c->idct_add              = ff_simple_idct_add_10;
+        c->idct                  = ff_simple_idct_10;
+        c->idct_permutation_type = FF_NO_IDCT_PERM;
+    } else {
         if(avctx->idct_algo==FF_IDCT_INT){
             c->idct_put= ff_jref_idct_put;
             c->idct_add= ff_jref_idct_add;
@@ -2849,7 +2802,6 @@ av_cold void ff_dsputil_init(DSPContext* c, AVCodecContext *avctx)
             c->idct     = ff_simple_idct_8;
             c->idct_permutation_type= FF_NO_IDCT_PERM;
         }
-        }
     }
 
     c->diff_pixels = diff_pixels_c;
diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index b7c0bed9ac..3906119cfd 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -46,9 +46,6 @@ void ff_fdct248_islow_8(DCTELEM *data);
 void ff_fdct248_islow_10(DCTELEM *data);
 
 void ff_j_rev_dct (DCTELEM *data);
-void ff_j_rev_dct4 (DCTELEM *data);
-void ff_j_rev_dct2 (DCTELEM *data);
-void ff_j_rev_dct1 (DCTELEM *data);
 void ff_wmv2_idct_c(DCTELEM *data);
 
 void ff_fdct_mmx(DCTELEM *block);
diff --git a/libavcodec/dv.c b/libavcodec/dv.c
index 9c0893a47a..79e73dd125 100644
--- a/libavcodec/dv.c
+++ b/libavcodec/dv.c
@@ -311,13 +311,7 @@ av_cold int ff_dvvideo_init(AVCodecContext *avctx)
     /* 248DCT setup */
     s->fdct[1]     = dsp.fdct248;
     s->idct_put[1] = ff_simple_idct248_put;  // FIXME: need to add it to DSP
-    if (avctx->lowres){
-        for (i = 0; i < 64; i++){
-            int j = ff_zigzag248_direct[i];
-            s->dv_zigzag[1][i] = dsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];
-        }
-    }else
-        memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
+    memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
 
     avctx->coded_frame = &s->picture;
     s->avctx = avctx;
diff --git a/libavcodec/dvdec.c b/libavcodec/dvdec.c
index 6b77a40568..ffa9c6d818 100644
--- a/libavcodec/dvdec.c
+++ b/libavcodec/dvdec.c
@@ -144,7 +144,7 @@ static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
     LOCAL_ALIGNED_16(DCTELEM, sblock, [5*DV_MAX_BPM], [64]);
     LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [  80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
     LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [5*80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
-    const int log2_blocksize = 3-s->avctx->lowres;
+    const int log2_blocksize = 3;
     int is_field_mode[5];
 
     assert((((int)mb_bit_buffer) & 7) == 0);
@@ -381,6 +381,5 @@ AVCodec ff_dvvideo_decoder = {
     .close          = dvvideo_close,
     .decode         = dvvideo_decode_frame,
     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
 };
diff --git a/libavcodec/error_resilience.c b/libavcodec/error_resilience.c
index d14adb4437..fa1e008584 100644
--- a/libavcodec/error_resilience.c
+++ b/libavcodec/error_resilience.c
@@ -891,7 +891,7 @@ void ff_er_frame_end(MpegEncContext *s)
 
     /* We do not support ER of field pictures yet,
      * though it should not crash if enabled. */
-    if (!s->err_recognition || s->error_count == 0 || s->avctx->lowres ||
+    if (!s->err_recognition || s->error_count == 0                     ||
         s->avctx->hwaccel                                              ||
         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU          ||
         s->picture_structure != PICT_FRAME                             ||
diff --git a/libavcodec/flvdec.c b/libavcodec/flvdec.c
index b4b171f500..fa074c4083 100644
--- a/libavcodec/flvdec.c
+++ b/libavcodec/flvdec.c
@@ -127,7 +127,6 @@ AVCodec ff_flv_decoder = {
     .close          = ff_h263_decode_end,
     .decode         = ff_h263_decode_frame,
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
index 078682dc5f..23dafc6a6e 100644
--- a/libavcodec/h261dec.c
+++ b/libavcodec/h261dec.c
@@ -651,6 +651,5 @@ AVCodec ff_h261_decoder = {
     .close          = h261_decode_end,
     .decode         = h261_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("H.261"),
 };
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index be4083f64f..cfd9a77edb 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -149,7 +149,7 @@ static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 
 static int decode_slice(MpegEncContext *s){
     const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
-    const int mb_size= 16>>s->avctx->lowres;
+    const int mb_size = 16;
     s->last_resync_gb= s->gb;
     s->first_slice_line= 1;
 
@@ -745,7 +745,6 @@ AVCodec ff_h263_decoder = {
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
     .flush          = ff_mpeg_flush,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
     .pix_fmts       = ff_hwaccel_pixfmt_list_420,
 };
diff --git a/libavcodec/intrax8.c b/libavcodec/intrax8.c
index 3ec6e69435..17426c510e 100644
--- a/libavcodec/intrax8.c
+++ b/libavcodec/intrax8.c
@@ -716,7 +716,6 @@ av_cold void ff_intrax8_common_end(IntraX8Context * w)
  * The parent codec must call MPV_frame_start(), ff_er_frame_start() before calling this function.
  * The parent codec must call ff_er_frame_end(), MPV_frame_end() after calling this function.
  * This function does not use MPV_decode_mb().
- * lowres decoding is theoretically impossible.
  * @param w pointer to IntraX8Context
  * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
  * @param quant_offset offset away from zero
diff --git a/libavcodec/jrevdct.c b/libavcodec/jrevdct.c
index 395eb8c638..e33558f825 100644
--- a/libavcodec/jrevdct.c
+++ b/libavcodec/jrevdct.c
@@ -940,216 +940,3 @@ void ff_j_rev_dct(DCTBLOCK data)
     dataptr++;                  /* advance pointer to next column */
   }
 }
-
-#undef DCTSIZE
-#define DCTSIZE 4
-#define DCTSTRIDE 8
-
-void ff_j_rev_dct4(DCTBLOCK data)
-{
-  int32_t tmp0, tmp1, tmp2, tmp3;
-  int32_t tmp10, tmp11, tmp12, tmp13;
-  int32_t z1;
-  int32_t d0, d2, d4, d6;
-  register DCTELEM *dataptr;
-  int rowctr;
-
-  /* Pass 1: process rows. */
-  /* Note results are scaled up by sqrt(8) compared to a true IDCT; */
-  /* furthermore, we scale the results by 2**PASS1_BITS. */
-
-  data[0] += 4;
-
-  dataptr = data;
-
-  for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--) {
-    /* Due to quantization, we will usually find that many of the input
-     * coefficients are zero, especially the AC terms.  We can exploit this
-     * by short-circuiting the IDCT calculation for any row in which all
-     * the AC terms are zero.  In that case each output is equal to the
-     * DC coefficient (with scale factor as needed).
-     * With typical images and quantization tables, half or more of the
-     * row DCT calculations can be simplified this way.
-     */
-
-    register int *idataptr = (int*)dataptr;
-
-    d0 = dataptr[0];
-    d2 = dataptr[1];
-    d4 = dataptr[2];
-    d6 = dataptr[3];
-
-    if ((d2 | d4 | d6) == 0) {
-      /* AC terms all zero */
-      if (d0) {
-          /* Compute a 32 bit value to assign. */
-          DCTELEM dcval = (DCTELEM) (d0 << PASS1_BITS);
-          register int v = (dcval & 0xffff) | ((dcval << 16) & 0xffff0000);
-
-          idataptr[0] = v;
-          idataptr[1] = v;
-      }
-
-      dataptr += DCTSTRIDE;     /* advance pointer to next row */
-      continue;
-    }
-
-    /* Even part: reverse the even part of the forward DCT. */
-    /* The rotator is sqrt(2)*c(-6). */
-    if (d6) {
-            if (d2) {
-                    /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
-                    z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
-                    tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
-                    tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
-
-                    tmp0 = (d0 + d4) << CONST_BITS;
-                    tmp1 = (d0 - d4) << CONST_BITS;
-
-                    tmp10 = tmp0 + tmp3;
-                    tmp13 = tmp0 - tmp3;
-                    tmp11 = tmp1 + tmp2;
-                    tmp12 = tmp1 - tmp2;
-            } else {
-                    /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
-                    tmp2 = MULTIPLY(-d6, FIX_1_306562965);
-                    tmp3 = MULTIPLY(d6, FIX_0_541196100);
-
-                    tmp0 = (d0 + d4) << CONST_BITS;
-                    tmp1 = (d0 - d4) << CONST_BITS;
-
-                    tmp10 = tmp0 + tmp3;
-                    tmp13 = tmp0 - tmp3;
-                    tmp11 = tmp1 + tmp2;
-                    tmp12 = tmp1 - tmp2;
-            }
-    } else {
-            if (d2) {
-                    /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
-                    tmp2 = MULTIPLY(d2, FIX_0_541196100);
-                    tmp3 = MULTIPLY(d2, FIX_1_306562965);
-
-                    tmp0 = (d0 + d4) << CONST_BITS;
-                    tmp1 = (d0 - d4) << CONST_BITS;
-
-                    tmp10 = tmp0 + tmp3;
-                    tmp13 = tmp0 - tmp3;
-                    tmp11 = tmp1 + tmp2;
-                    tmp12 = tmp1 - tmp2;
-            } else {
-                    /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
-                    tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
-                    tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
-            }
-      }
-
-    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
-
-    dataptr[0] = (DCTELEM) DESCALE(tmp10, CONST_BITS-PASS1_BITS);
-    dataptr[1] = (DCTELEM) DESCALE(tmp11, CONST_BITS-PASS1_BITS);
-    dataptr[2] = (DCTELEM) DESCALE(tmp12, CONST_BITS-PASS1_BITS);
-    dataptr[3] = (DCTELEM) DESCALE(tmp13, CONST_BITS-PASS1_BITS);
-
-    dataptr += DCTSTRIDE;       /* advance pointer to next row */
-  }
-
-  /* Pass 2: process columns. */
-  /* Note that we must descale the results by a factor of 8 == 2**3, */
-  /* and also undo the PASS1_BITS scaling. */
-
-  dataptr = data;
-  for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--) {
-    /* Columns of zeroes can be exploited in the same way as we did with rows.
-     * However, the row calculation has created many nonzero AC terms, so the
-     * simplification applies less often (typically 5% to 10% of the time).
-     * On machines with very fast multiplication, it's possible that the
-     * test takes more time than it's worth.  In that case this section
-     * may be commented out.
-     */
-
-    d0 = dataptr[DCTSTRIDE*0];
-    d2 = dataptr[DCTSTRIDE*1];
-    d4 = dataptr[DCTSTRIDE*2];
-    d6 = dataptr[DCTSTRIDE*3];
-
-    /* Even part: reverse the even part of the forward DCT. */
-    /* The rotator is sqrt(2)*c(-6). */
-    if (d6) {
-            if (d2) {
-                    /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
-                    z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
-                    tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
-                    tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
-
-                    tmp0 = (d0 + d4) << CONST_BITS;
-                    tmp1 = (d0 - d4) << CONST_BITS;
-
-                    tmp10 = tmp0 + tmp3;
-                    tmp13 = tmp0 - tmp3;
-                    tmp11 = tmp1 + tmp2;
-                    tmp12 = tmp1 - tmp2;
-            } else {
-                    /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
-                    tmp2 = MULTIPLY(-d6, FIX_1_306562965);
-                    tmp3 = MULTIPLY(d6, FIX_0_541196100);
-
-                    tmp0 = (d0 + d4) << CONST_BITS;
-                    tmp1 = (d0 - d4) << CONST_BITS;
-
-                    tmp10 = tmp0 + tmp3;
-                    tmp13 = tmp0 - tmp3;
-                    tmp11 = tmp1 + tmp2;
-                    tmp12 = tmp1 - tmp2;
-            }
-    } else {
-            if (d2) {
-                    /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
-                    tmp2 = MULTIPLY(d2, FIX_0_541196100);
-                    tmp3 = MULTIPLY(d2, FIX_1_306562965);
-
-                    tmp0 = (d0 + d4) << CONST_BITS;
-                    tmp1 = (d0 - d4) << CONST_BITS;
-
-                    tmp10 = tmp0 + tmp3;
-                    tmp13 = tmp0 - tmp3;
-                    tmp11 = tmp1 + tmp2;
-                    tmp12 = tmp1 - tmp2;
-            } else {
-                    /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
-                    tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
-                    tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
-            }
-    }
-
-    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
-
-    dataptr[DCTSTRIDE*0] = tmp10 >> (CONST_BITS+PASS1_BITS+3);
-    dataptr[DCTSTRIDE*1] = tmp11 >> (CONST_BITS+PASS1_BITS+3);
-    dataptr[DCTSTRIDE*2] = tmp12 >> (CONST_BITS+PASS1_BITS+3);
-    dataptr[DCTSTRIDE*3] = tmp13 >> (CONST_BITS+PASS1_BITS+3);
-
-    dataptr++;                  /* advance pointer to next column */
-  }
-}
-
-void ff_j_rev_dct2(DCTBLOCK data){
-  int d00, d01, d10, d11;
-
-  data[0] += 4;
-  d00 = data[0+0*DCTSTRIDE] + data[1+0*DCTSTRIDE];
-  d01 = data[0+0*DCTSTRIDE] - data[1+0*DCTSTRIDE];
-  d10 = data[0+1*DCTSTRIDE] + data[1+1*DCTSTRIDE];
-  d11 = data[0+1*DCTSTRIDE] - data[1+1*DCTSTRIDE];
-
-  data[0+0*DCTSTRIDE]= (d00 + d10)>>3;
-  data[1+0*DCTSTRIDE]= (d01 + d11)>>3;
-  data[0+1*DCTSTRIDE]= (d00 - d10)>>3;
-  data[1+1*DCTSTRIDE]= (d01 - d11)>>3;
-}
-
-void ff_j_rev_dct1(DCTBLOCK data){
-  data[0] = (data[0] + 4)>>3;
-}
-
-#undef FIX
-#undef CONST_BITS
diff --git a/libavcodec/libopenjpeg.c b/libavcodec/libopenjpeg.c
index 3ea6203ad2..799ccd7745 100644
--- a/libavcodec/libopenjpeg.c
+++ b/libavcodec/libopenjpeg.c
@@ -158,7 +158,6 @@ static int libopenjpeg_decode_frame(AVCodecContext *avctx,
     ff_thread_finish_setup(avctx);
 
     ctx->dec_params.cp_limit_decoding = NO_LIMITATION;
-    ctx->dec_params.cp_reduce = avctx->lowres;
     // Tie decoder with decoding parameters
     opj_setup_decoder(dec, &ctx->dec_params);
     stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
@@ -219,7 +218,6 @@ AVCodec ff_libopenjpeg_decoder = {
     .close            = libopenjpeg_decode_close,
     .decode           = libopenjpeg_decode_frame,
     .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
-    .max_lowres       = 5,
     .long_name        = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
     .init_thread_copy = ONLY_IF_THREADS_ENABLED(libopenjpeg_decode_init_thread_copy),
 };
diff --git a/libavcodec/mjpegbdec.c b/libavcodec/mjpegbdec.c
index 3a2ae13b20..7ba5abf9bd 100644
--- a/libavcodec/mjpegbdec.c
+++ b/libavcodec/mjpegbdec.c
@@ -161,6 +161,5 @@ AVCodec ff_mjpegb_decoder = {
     .close          = ff_mjpeg_decode_end,
     .decode         = mjpegb_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("Apple MJPEG-B"),
 };
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 5eab559f84..8552ec1a6f 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -796,21 +796,6 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
     return 0;
 }
 
-static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
-                                              int linesize, int lowres)
-{
-    switch (lowres) {
-    case 0: copy_block8(dst, src, linesize, linesize, 8);
-        break;
-    case 1: copy_block4(dst, src, linesize, linesize, 4);
-        break;
-    case 2: copy_block2(dst, src, linesize, linesize, 2);
-        break;
-    case 3: *dst = *src;
-        break;
-    }
-}
-
 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
                              int Al, const uint8_t *mb_bitmask,
                              const AVFrame *reference)
@@ -869,16 +854,16 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
                 x = 0;
                 y = 0;
                 for (j = 0; j < n; j++) {
-                    block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
-                                     (h * mb_x + x) * 8) >> s->avctx->lowres);
+                    block_offset = ((linesize[c] * (v * mb_y + y) * 8) +
+                                    (h * mb_x + x) * 8);
 
                     if (s->interlaced && s->bottom_field)
                         block_offset += linesize[c] >> 1;
                     ptr = data[c] + block_offset;
                     if (!s->progressive) {
                         if (copy_mb)
-                            mjpeg_copy_block(ptr, reference_data[c] + block_offset,
-                                             linesize[c], s->avctx->lowres);
+                            copy_block8(ptr, reference_data[c] + block_offset,
+                                        linesize[c], linesize[c], 8);
                         else {
                             s->dsp.clear_block(s->block);
                             if (decode_block(s, s->block, i,
@@ -968,7 +953,7 @@ static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
     }
 
     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
-        int block_offset = (mb_y * linesize * 8 >> s->avctx->lowres);
+        int block_offset = mb_y * linesize * 8;
         uint8_t *ptr     = data + block_offset;
         int block_idx    = mb_y * s->block_stride[c];
         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
@@ -993,11 +978,11 @@ static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
 
             if (last_scan) {
                 if (copy_mb) {
-                    mjpeg_copy_block(ptr, reference_data + block_offset,
-                                     linesize, s->avctx->lowres);
+                    copy_block8(ptr, reference_data + block_offset,
+                                linesize, linesize, 8);
                 } else {
                     s->dsp.idct_put(ptr, linesize, *block);
-                    ptr += 8 >> s->avctx->lowres;
+                    ptr += 8;
                 }
             }
         }
@@ -1667,7 +1652,6 @@ AVCodec ff_mjpeg_decoder = {
     .close          = ff_mjpeg_decode_end,
     .decode         = ff_mjpeg_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
     .priv_class     = &mjpegdec_class,
 };
@@ -1681,6 +1665,5 @@ AVCodec ff_thp_decoder = {
     .close          = ff_mjpeg_decode_end,
     .decode         = ff_mjpeg_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
 };
diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 8cdc704c73..40ba97b0d0 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -1631,7 +1631,6 @@ static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
                              const uint8_t **buf, int buf_size)
 {
     AVCodecContext *avctx = s->avctx;
-    const int lowres      = s->avctx->lowres;
     const int field_pic   = s->picture_structure != PICT_FRAME;
 
     s->resync_mb_x =
@@ -1752,14 +1751,14 @@ static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
             }
         }
 
-        s->dest[0] += 16 >> lowres;
-        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
-        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
+        s->dest[0] += 16;
+        s->dest[1] += 16 >> s->chroma_x_shift;
+        s->dest[2] += 16 >> s->chroma_x_shift;
 
         ff_MPV_decode_mb(s, s->block);
 
         if (++s->mb_x >= s->mb_width) {
-            const int mb_size = 16 >> s->avctx->lowres;
+            const int mb_size = 16;
 
             ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
             ff_MPV_report_decode_progress(s);
@@ -2508,7 +2507,6 @@ AVCodec ff_mpeg1video_decoder = {
                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                              CODEC_CAP_SLICE_THREADS,
     .flush                 = flush,
-    .max_lowres            = 3,
     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
 };
@@ -2525,7 +2523,6 @@ AVCodec ff_mpeg2video_decoder = {
                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                       CODEC_CAP_SLICE_THREADS,
     .flush          = flush,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
 };
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index f45d86fd35..3fcc6d0489 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -2266,7 +2266,6 @@ AVCodec ff_mpeg4_decoder = {
                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                              CODEC_CAP_FRAME_THREADS,
     .flush                 = ff_mpeg_flush,
-    .max_lowres            = 3,
     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
     .pix_fmts              = ff_hwaccel_pixfmt_list_420,
     .profiles              = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 280207530b..d1c42331c2 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1815,364 +1815,6 @@ void ff_print_debug_info(MpegEncContext *s, AVFrame *pict)
     }
 }
 
-static inline int hpel_motion_lowres(MpegEncContext *s,
-                                     uint8_t *dest, uint8_t *src,
-                                     int field_based, int field_select,
-                                     int src_x, int src_y,
-                                     int width, int height, int stride,
-                                     int h_edge_pos, int v_edge_pos,
-                                     int w, int h, h264_chroma_mc_func *pix_op,
-                                     int motion_x, int motion_y)
-{
-    const int lowres   = s->avctx->lowres;
-    const int op_index = FFMIN(lowres, 2);
-    const int s_mask   = (2 << lowres) - 1;
-    int emu = 0;
-    int sx, sy;
-
-    if (s->quarter_sample) {
-        motion_x /= 2;
-        motion_y /= 2;
-    }
-
-    sx = motion_x & s_mask;
-    sy = motion_y & s_mask;
-    src_x += motion_x >> lowres + 1;
-    src_y += motion_y >> lowres + 1;
-
-    src   += src_y * stride + src_x;
-
-    if ((unsigned)src_x > FFMAX( h_edge_pos - (!!sx) - w,                 0) ||
-        (unsigned)src_y > FFMAX((v_edge_pos >> field_based) - (!!sy) - h, 0)) {
-        s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->linesize, w + 1,
-                                (h + 1) << field_based, src_x,
-                                src_y   << field_based,
-                                h_edge_pos,
-                                v_edge_pos);
-        src = s->edge_emu_buffer;
-        emu = 1;
-    }
-
-    sx = (sx << 2) >> lowres;
-    sy = (sy << 2) >> lowres;
-    if (field_select)
-        src += s->linesize;
-    pix_op[op_index](dest, src, stride, h, sx, sy);
-    return emu;
-}
-
-/* apply one mpeg motion vector to the three components */
-static av_always_inline void mpeg_motion_lowres(MpegEncContext *s,
-                                                uint8_t *dest_y,
-                                                uint8_t *dest_cb,
-                                                uint8_t *dest_cr,
-                                                int field_based,
-                                                int bottom_field,
-                                                int field_select,
-                                                uint8_t **ref_picture,
-                                                h264_chroma_mc_func *pix_op,
-                                                int motion_x, int motion_y,
-                                                int h, int mb_y)
-{
-    uint8_t *ptr_y, *ptr_cb, *ptr_cr;
-    int mx, my, src_x, src_y, uvsrc_x, uvsrc_y, uvlinesize, linesize, sx, sy,
-        uvsx, uvsy;
-    const int lowres     = s->avctx->lowres;
-    const int op_index   = FFMIN(lowres, 2);
-    const int block_s    = 8>>lowres;
-    const int s_mask     = (2 << lowres) - 1;
-    const int h_edge_pos = s->h_edge_pos >> lowres;
-    const int v_edge_pos = s->v_edge_pos >> lowres;
-    linesize   = s->current_picture.f.linesize[0] << field_based;
-    uvlinesize = s->current_picture.f.linesize[1] << field_based;
-
-    // FIXME obviously not perfect but qpel will not work in lowres anyway
-    if (s->quarter_sample) {
-        motion_x /= 2;
-        motion_y /= 2;
-    }
-
-    if (field_based) {
-        motion_y += (bottom_field - field_select) * (1 << lowres - 1);
-    }
-
-    sx = motion_x & s_mask;
-    sy = motion_y & s_mask;
-    src_x = s->mb_x * 2 * block_s + (motion_x >> lowres + 1);
-    src_y = (mb_y * 2 * block_s >> field_based) + (motion_y >> lowres + 1);
-
-    if (s->out_format == FMT_H263) {
-        uvsx    = ((motion_x >> 1) & s_mask) | (sx & 1);
-        uvsy    = ((motion_y >> 1) & s_mask) | (sy & 1);
-        uvsrc_x = src_x >> 1;
-        uvsrc_y = src_y >> 1;
-    } else if (s->out_format == FMT_H261) {
-        // even chroma mv's are full pel in H261
-        mx      = motion_x / 4;
-        my      = motion_y / 4;
-        uvsx    = (2 * mx) & s_mask;
-        uvsy    = (2 * my) & s_mask;
-        uvsrc_x = s->mb_x * block_s + (mx >> lowres);
-        uvsrc_y =    mb_y * block_s + (my >> lowres);
-    } else {
-        mx      = motion_x / 2;
-        my      = motion_y / 2;
-        uvsx    = mx & s_mask;
-        uvsy    = my & s_mask;
-        uvsrc_x = s->mb_x * block_s                 + (mx >> lowres + 1);
-        uvsrc_y =   (mb_y * block_s >> field_based) + (my >> lowres + 1);
-    }
-
-    ptr_y  = ref_picture[0] + src_y   * linesize   + src_x;
-    ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;
-    ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;
-
-    if ((unsigned) src_x > FFMAX( h_edge_pos - (!!sx) - 2 * block_s,       0) ||
-        (unsigned) src_y > FFMAX((v_edge_pos >> field_based) - (!!sy) - h, 0)) {
-        s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr_y,
-                                s->linesize, 17, 17 + field_based,
-                                src_x, src_y << field_based, h_edge_pos,
-                                v_edge_pos);
-        ptr_y = s->edge_emu_buffer;
-        if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {
-            uint8_t *uvbuf = s->edge_emu_buffer + 18 * s->linesize;
-            s->dsp.emulated_edge_mc(uvbuf , ptr_cb, s->uvlinesize, 9,
-                                    9 + field_based,
-                                    uvsrc_x, uvsrc_y << field_based,
-                                    h_edge_pos >> 1, v_edge_pos >> 1);
-            s->dsp.emulated_edge_mc(uvbuf + 16, ptr_cr, s->uvlinesize, 9,
-                                    9 + field_based,
-                                    uvsrc_x, uvsrc_y << field_based,
-                                    h_edge_pos >> 1, v_edge_pos >> 1);
-            ptr_cb = uvbuf;
-            ptr_cr = uvbuf + 16;
-        }
-    }
-
-    // FIXME use this for field pix too instead of the obnoxious hack which changes picture.f.data
-    if (bottom_field) {
-        dest_y  += s->linesize;
-        dest_cb += s->uvlinesize;
-        dest_cr += s->uvlinesize;
-    }
-
-    if (field_select) {
-        ptr_y   += s->linesize;
-        ptr_cb  += s->uvlinesize;
-        ptr_cr  += s->uvlinesize;
-    }
-
-    sx = (sx << 2) >> lowres;
-    sy = (sy << 2) >> lowres;
-    pix_op[lowres - 1](dest_y, ptr_y, linesize, h, sx, sy);
-
-    if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {
-        uvsx = (uvsx << 2) >> lowres;
-        uvsy = (uvsy << 2) >> lowres;
-        pix_op[op_index](dest_cb, ptr_cb, uvlinesize, h >> s->chroma_y_shift,
-                         uvsx, uvsy);
-        pix_op[op_index](dest_cr, ptr_cr, uvlinesize, h >> s->chroma_y_shift,
-                         uvsx, uvsy);
-    }
-    // FIXME h261 lowres loop filter
-}
-
-static inline void chroma_4mv_motion_lowres(MpegEncContext *s,
-                                            uint8_t *dest_cb, uint8_t *dest_cr,
-                                            uint8_t **ref_picture,
-                                            h264_chroma_mc_func * pix_op,
-                                            int mx, int my)
-{
-    const int lowres     = s->avctx->lowres;
-    const int op_index   = FFMIN(lowres, 2);
-    const int block_s    = 8 >> lowres;
-    const int s_mask     = (2 << lowres) - 1;
-    const int h_edge_pos = s->h_edge_pos >> lowres + 1;
-    const int v_edge_pos = s->v_edge_pos >> lowres + 1;
-    int emu = 0, src_x, src_y, offset, sx, sy;
-    uint8_t *ptr;
-
-    if (s->quarter_sample) {
-        mx /= 2;
-        my /= 2;
-    }
-
-    /* In case of 8X8, we construct a single chroma motion vector
-       with a special rounding */
-    mx = ff_h263_round_chroma(mx);
-    my = ff_h263_round_chroma(my);
-
-    sx = mx & s_mask;
-    sy = my & s_mask;
-    src_x = s->mb_x * block_s + (mx >> lowres + 1);
-    src_y = s->mb_y * block_s + (my >> lowres + 1);
-
-    offset = src_y * s->uvlinesize + src_x;
-    ptr = ref_picture[1] + offset;
-    if (s->flags & CODEC_FLAG_EMU_EDGE) {
-        if ((unsigned) src_x > FFMAX(h_edge_pos - (!!sx) - block_s, 0) ||
-            (unsigned) src_y > FFMAX(v_edge_pos - (!!sy) - block_s, 0)) {
-            s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize,
-                                    9, 9, src_x, src_y, h_edge_pos, v_edge_pos);
-            ptr = s->edge_emu_buffer;
-            emu = 1;
-        }
-    }
-    sx = (sx << 2) >> lowres;
-    sy = (sy << 2) >> lowres;
-    pix_op[op_index](dest_cb, ptr, s->uvlinesize, block_s, sx, sy);
-
-    ptr = ref_picture[2] + offset;
-    if (emu) {
-        s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
-                                src_x, src_y, h_edge_pos, v_edge_pos);
-        ptr = s->edge_emu_buffer;
-    }
-    pix_op[op_index](dest_cr, ptr, s->uvlinesize, block_s, sx, sy);
-}
-
-/**
- * motion compensation of a single macroblock
- * @param s context
- * @param dest_y luma destination pointer
- * @param dest_cb chroma cb/u destination pointer
- * @param dest_cr chroma cr/v destination pointer
- * @param dir direction (0->forward, 1->backward)
- * @param ref_picture array[3] of pointers to the 3 planes of the reference picture
- * @param pix_op halfpel motion compensation function (average or put normally)
- * the motion vectors are taken from s->mv and the MV type from s->mv_type
- */
-static inline void MPV_motion_lowres(MpegEncContext *s,
-                                     uint8_t *dest_y, uint8_t *dest_cb,
-                                     uint8_t *dest_cr,
-                                     int dir, uint8_t **ref_picture,
-                                     h264_chroma_mc_func *pix_op)
-{
-    int mx, my;
-    int mb_x, mb_y, i;
-    const int lowres  = s->avctx->lowres;
-    const int block_s = 8 >>lowres;
-
-    mb_x = s->mb_x;
-    mb_y = s->mb_y;
-
-    switch (s->mv_type) {
-    case MV_TYPE_16X16:
-        mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
-                           0, 0, 0,
-                           ref_picture, pix_op,
-                           s->mv[dir][0][0], s->mv[dir][0][1],
-                           2 * block_s, mb_y);
-        break;
-    case MV_TYPE_8X8:
-        mx = 0;
-        my = 0;
-        for (i = 0; i < 4; i++) {
-            hpel_motion_lowres(s, dest_y + ((i & 1) + (i >> 1) *
-                               s->linesize) * block_s,
-                               ref_picture[0], 0, 0,
-                               (2 * mb_x + (i & 1)) * block_s,
-                               (2 * mb_y + (i >> 1)) * block_s,
-                               s->width, s->height, s->linesize,
-                               s->h_edge_pos >> lowres, s->v_edge_pos >> lowres,
-                               block_s, block_s, pix_op,
-                               s->mv[dir][i][0], s->mv[dir][i][1]);
-
-            mx += s->mv[dir][i][0];
-            my += s->mv[dir][i][1];
-        }
-
-        if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY))
-            chroma_4mv_motion_lowres(s, dest_cb, dest_cr, ref_picture,
-                                     pix_op, mx, my);
-        break;
-    case MV_TYPE_FIELD:
-        if (s->picture_structure == PICT_FRAME) {
-            /* top field */
-            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
-                               1, 0, s->field_select[dir][0],
-                               ref_picture, pix_op,
-                               s->mv[dir][0][0], s->mv[dir][0][1],
-                               block_s, mb_y);
-            /* bottom field */
-            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
-                               1, 1, s->field_select[dir][1],
-                               ref_picture, pix_op,
-                               s->mv[dir][1][0], s->mv[dir][1][1],
-                               block_s, mb_y);
-        } else {
-            if (s->picture_structure != s->field_select[dir][0] + 1 &&
-                s->pict_type != AV_PICTURE_TYPE_B && !s->first_field) {
-                ref_picture = s->current_picture_ptr->f.data;
-
-            }
-            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
-                               0, 0, s->field_select[dir][0],
-                               ref_picture, pix_op,
-                               s->mv[dir][0][0],
-                               s->mv[dir][0][1], 2 * block_s, mb_y >> 1);
-            }
-        break;
-    case MV_TYPE_16X8:
-        for (i = 0; i < 2; i++) {
-            uint8_t **ref2picture;
-
-            if (s->picture_structure == s->field_select[dir][i] + 1 ||
-                s->pict_type == AV_PICTURE_TYPE_B || s->first_field) {
-                ref2picture = ref_picture;
-            } else {
-                ref2picture = s->current_picture_ptr->f.data;
-            }
-
-            mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
-                               0, 0, s->field_select[dir][i],
-                               ref2picture, pix_op,
-                               s->mv[dir][i][0], s->mv[dir][i][1] +
-                               2 * block_s * i, block_s, mb_y >> 1);
-
-            dest_y  +=  2 * block_s *  s->linesize;
-            dest_cb += (2 * block_s >> s->chroma_y_shift) * s->uvlinesize;
-            dest_cr += (2 * block_s >> s->chroma_y_shift) * s->uvlinesize;
-        }
-        break;
-    case MV_TYPE_DMV:
-        if (s->picture_structure == PICT_FRAME) {
-            for (i = 0; i < 2; i++) {
-                int j;
-                for (j = 0; j < 2; j++) {
-                    mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
-                                       1, j, j ^ i,
-                                       ref_picture, pix_op,
-                                       s->mv[dir][2 * i + j][0],
-                                       s->mv[dir][2 * i + j][1],
-                                       block_s, mb_y);
-                }
-                pix_op = s->dsp.avg_h264_chroma_pixels_tab;
-            }
-        } else {
-            for (i = 0; i < 2; i++) {
-                mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
-                                   0, 0, s->picture_structure != i + 1,
-                                   ref_picture, pix_op,
-                                   s->mv[dir][2 * i][0],s->mv[dir][2 * i][1],
-                                   2 * block_s, mb_y >> 1);
-
-                // after put we make avg of the same block
-                pix_op = s->dsp.avg_h264_chroma_pixels_tab;
-
-                // opposite parity is always in the same
-                // frame if this is second field
-                if (!s->first_field) {
-                    ref_picture = s->current_picture_ptr->f.data;
-                }
-            }
-        }
-        break;
-    default:
-        assert(0);
-    }
-}
-
 /**
  * find the lowest MB row referenced in the MVs
  */
@@ -2282,7 +1924,7 @@ void ff_clean_intra_table_entries(MpegEncContext *s)
  */
 static av_always_inline
 void MPV_decode_mb_internal(MpegEncContext *s, DCTELEM block[12][64],
-                            int lowres_flag, int is_mpeg12)
+                            int is_mpeg12)
 {
     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration){
@@ -2327,8 +1969,8 @@ void MPV_decode_mb_internal(MpegEncContext *s, DCTELEM block[12][64],
         qpel_mc_func (*op_qpix)[16];
         const int linesize   = s->current_picture.f.linesize[0]; //not s->linesize as this would be wrong for field pics
         const int uvlinesize = s->current_picture.f.linesize[1];
-        const int readable= s->pict_type != AV_PICTURE_TYPE_B || s->encoding || s->avctx->draw_horiz_band || lowres_flag;
-        const int block_size= lowres_flag ? 8>>s->avctx->lowres : 8;
+        const int readable= s->pict_type != AV_PICTURE_TYPE_B || s->encoding || s->avctx->draw_horiz_band;
+        const int block_size = 8;
 
         /* avoid copy if macroblock skipped in last frame too */
         /* skip only during decoding as we might trash the buffers during encoding a bit */
@@ -2377,31 +2019,19 @@ void MPV_decode_mb_internal(MpegEncContext *s, DCTELEM block[12][64],
                     }
                 }
 
-                if(lowres_flag){
-                    h264_chroma_mc_func *op_pix = s->dsp.put_h264_chroma_pixels_tab;
-
-                    if (s->mv_dir & MV_DIR_FORWARD) {
-                        MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f.data, op_pix);
-                        op_pix = s->dsp.avg_h264_chroma_pixels_tab;
-                    }
-                    if (s->mv_dir & MV_DIR_BACKWARD) {
-                        MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f.data, op_pix);
-                    }
+                op_qpix= s->me.qpel_put;
+                if ((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
+                    op_pix = s->dsp.put_pixels_tab;
                 }else{
-                    op_qpix= s->me.qpel_put;
-                    if ((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
-                        op_pix = s->dsp.put_pixels_tab;
-                    }else{
-                        op_pix = s->dsp.put_no_rnd_pixels_tab;
-                    }
-                    if (s->mv_dir & MV_DIR_FORWARD) {
-                        MPV_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f.data, op_pix, op_qpix);
-                        op_pix = s->dsp.avg_pixels_tab;
-                        op_qpix= s->me.qpel_avg;
-                    }
-                    if (s->mv_dir & MV_DIR_BACKWARD) {
-                        MPV_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f.data, op_pix, op_qpix);
-                    }
+                    op_pix = s->dsp.put_no_rnd_pixels_tab;
+                }
+                if (s->mv_dir & MV_DIR_FORWARD) {
+                    MPV_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f.data, op_pix, op_qpix);
+                    op_pix = s->dsp.avg_pixels_tab;
+                    op_qpix= s->me.qpel_avg;
+                }
+                if (s->mv_dir & MV_DIR_BACKWARD) {
+                    MPV_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f.data, op_pix, op_qpix);
                 }
             }
 
@@ -2527,12 +2157,10 @@ skip_idct:
 void ff_MPV_decode_mb(MpegEncContext *s, DCTELEM block[12][64]){
 #if !CONFIG_SMALL
     if(s->out_format == FMT_MPEG1) {
-        if(s->avctx->lowres) MPV_decode_mb_internal(s, block, 1, 1);
-        else                 MPV_decode_mb_internal(s, block, 0, 1);
+        MPV_decode_mb_internal(s, block, 1);
     } else
 #endif
-    if(s->avctx->lowres) MPV_decode_mb_internal(s, block, 1, 0);
-    else                  MPV_decode_mb_internal(s, block, 0, 0);
+        MPV_decode_mb_internal(s, block, 0);
 }
 
 /**
@@ -2607,7 +2235,7 @@ void ff_draw_horiz_band(MpegEncContext *s, int y, int h){
 void ff_init_block_index(MpegEncContext *s){ //FIXME maybe rename
     const int linesize   = s->current_picture.f.linesize[0]; //not s->linesize as this would be wrong for field pics
     const int uvlinesize = s->current_picture.f.linesize[1];
-    const int mb_size= 4 - s->avctx->lowres;
+    const int mb_size= 4;
 
     s->block_index[0]= s->b8_stride*(s->mb_y*2    ) - 2 + s->mb_x*2;
     s->block_index[1]= s->b8_stride*(s->mb_y*2    ) - 1 + s->mb_x*2;
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 8f788a7c06..b73da416ba 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -785,7 +785,7 @@ extern const enum PixelFormat ff_pixfmt_list_420[];
 extern const enum PixelFormat ff_hwaccel_pixfmt_list_420[];
 
 static inline void ff_update_block_index(MpegEncContext *s){
-    const int block_size= 8>>s->avctx->lowres;
+    const int block_size = 8;
 
     s->block_index[0]+=2;
     s->block_index[1]+=2;
diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c
index a91eea52a5..eed5067690 100644
--- a/libavcodec/msmpeg4.c
+++ b/libavcodec/msmpeg4.c
@@ -1216,7 +1216,6 @@ AVCodec ff_msmpeg4v1_decoder = {
     .close          = ff_h263_decode_end,
     .decode         = ff_h263_decode_frame,
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
@@ -1230,7 +1229,6 @@ AVCodec ff_msmpeg4v2_decoder = {
     .close          = ff_h263_decode_end,
     .decode         = ff_h263_decode_frame,
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
@@ -1244,7 +1242,6 @@ AVCodec ff_msmpeg4v3_decoder = {
     .close          = ff_h263_decode_end,
     .decode         = ff_h263_decode_frame,
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
@@ -1258,7 +1255,6 @@ AVCodec ff_wmv1_decoder = {
     .close          = ff_h263_decode_end,
     .decode         = ff_h263_decode_frame,
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
diff --git a/libavcodec/mxpegdec.c b/libavcodec/mxpegdec.c
index c00997007a..aeb474f287 100644
--- a/libavcodec/mxpegdec.c
+++ b/libavcodec/mxpegdec.c
@@ -338,5 +338,4 @@ AVCodec ff_mxpeg_decoder = {
     .close          = mxpeg_decode_end,
     .decode         = mxpeg_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .max_lowres     = 3,
 };
diff --git a/libavcodec/options_table.h b/libavcodec/options_table.h
index 6615ade1a6..1e2560c941 100644
--- a/libavcodec/options_table.h
+++ b/libavcodec/options_table.h
@@ -318,7 +318,6 @@ static const AVOption options[]={
 {"dts_hd_ma", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_PROFILE_DTS_HD_MA }, INT_MIN, INT_MAX, A|E, "profile"},
 {"level", NULL, OFFSET(level), AV_OPT_TYPE_INT, {.dbl = FF_LEVEL_UNKNOWN }, INT_MIN, INT_MAX, V|A|E, "level"},
 {"unknown", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LEVEL_UNKNOWN }, INT_MIN, INT_MAX, V|A|E, "level"},
-{"lowres", "decode at 1= 1/2, 2=1/4, 3=1/8 resolutions", OFFSET(lowres), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, V|A|D},
 {"skip_threshold", "frame skip threshold", OFFSET(frame_skip_threshold), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX, V|E},
 {"skip_factor", "frame skip factor", OFFSET(frame_skip_factor), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX, V|E},
 {"skip_exp", "frame skip exponent", OFFSET(frame_skip_exp), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX, V|E},
diff --git a/libavcodec/ppc/dsputil_ppc.c b/libavcodec/ppc/dsputil_ppc.c
index ab8f7aef48..de347835e6 100644
--- a/libavcodec/ppc/dsputil_ppc.c
+++ b/libavcodec/ppc/dsputil_ppc.c
@@ -179,7 +179,7 @@ void ff_dsputil_init_ppc(DSPContext* c, AVCodecContext *avctx)
         }
 #endif //CONFIG_ENCODERS
 
-        if (avctx->lowres == 0 && avctx->bits_per_raw_sample <= 8) {
+        if (avctx->bits_per_raw_sample <= 8) {
             if ((avctx->idct_algo == FF_IDCT_AUTO) ||
                 (avctx->idct_algo == FF_IDCT_ALTIVEC)) {
                 c->idct_put = ff_idct_put_altivec;
diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index c5047adb8e..bc81f08b9c 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -409,8 +409,7 @@ av_log(s->avctx, AV_LOG_DEBUG, "\n");*/
 //    s->obmc=1;
 //    s->umvplus=1;
     s->modified_quant=1;
-    if(!s->avctx->lowres)
-        s->loop_filter=1;
+    s->loop_filter=1;
 
     if(s->avctx->debug & FF_DEBUG_PICT_INFO){
             av_log(s->avctx, AV_LOG_INFO, "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
@@ -727,7 +726,6 @@ AVCodec ff_rv10_decoder = {
     .close          = rv10_decode_end,
     .decode         = rv10_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
@@ -742,7 +740,6 @@ AVCodec ff_rv20_decoder = {
     .decode         = rv10_decode_frame,
     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
     .flush          = ff_mpeg_flush,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
diff --git a/libavcodec/sp5xdec.c b/libavcodec/sp5xdec.c
index 256c2756ef..253c211709 100644
--- a/libavcodec/sp5xdec.c
+++ b/libavcodec/sp5xdec.c
@@ -102,7 +102,6 @@ AVCodec ff_sp5x_decoder = {
     .close          = ff_mjpeg_decode_end,
     .decode         = sp5x_decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
 };
 
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 7caf93f65d..4492486771 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -143,8 +143,8 @@ unsigned avcodec_get_edge_width(void)
 void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
     s->coded_width = width;
     s->coded_height= height;
-    s->width = -((-width )>>s->lowres);
-    s->height= -((-height)>>s->lowres);
+    s->width  = width;
+    s->height = height;
 }
 
 #define INTERNAL_BUFFER_SIZE (32+1)
@@ -228,9 +228,8 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
 
     *width = FFALIGN(*width , w_align);
     *height= FFALIGN(*height, h_align);
-    if(s->codec_id == CODEC_ID_H264 || s->lowres)
+    if (s->codec_id == CODEC_ID_H264)
         *height+=2; // some of the optimized chroma MC reads one line too much
-                    // which is also done in mpeg decoders with lowres > 0
 
     for (i = 0; i < 4; i++)
         linesize_align[i] = STRIDE_ALIGN;
@@ -741,12 +740,6 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
     if (!HAVE_THREADS && !(codec->capabilities & CODEC_CAP_AUTO_THREADS))
         avctx->thread_count = 1;
 
-    if (avctx->codec->max_lowres < avctx->lowres) {
-        av_log(avctx, AV_LOG_ERROR, "The maximum value for lowres supported by the decoder is %d\n",
-               avctx->codec->max_lowres);
-        ret = AVERROR(EINVAL);
-        goto free_and_end;
-    }
     if (av_codec_is_encoder(avctx->codec)) {
         int i;
         if (avctx->codec->sample_fmts) {
diff --git a/libavcodec/wmv2dec.c b/libavcodec/wmv2dec.c
index 4847efac31..2e4bbaac50 100644
--- a/libavcodec/wmv2dec.c
+++ b/libavcodec/wmv2dec.c
@@ -479,7 +479,6 @@ AVCodec ff_wmv2_decoder = {
     .close          = wmv2_decode_end,
     .decode         = ff_h263_decode_frame,
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .max_lowres     = 3,
     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
     .pix_fmts       = ff_pixfmt_list_420,
 };
diff --git a/libavcodec/x86/dsputil_mmx.c b/libavcodec/x86/dsputil_mmx.c
index 6695cafb65..89be32840d 100644
--- a/libavcodec/x86/dsputil_mmx.c
+++ b/libavcodec/x86/dsputil_mmx.c
@@ -3121,7 +3121,7 @@ void ff_dsputil_init_mmx(DSPContext *c, AVCodecContext *avctx)
     if (mm_flags & AV_CPU_FLAG_MMX) {
         const int idct_algo = avctx->idct_algo;
 
-        if (avctx->lowres == 0 && avctx->bits_per_raw_sample <= 8) {
+        if (avctx->bits_per_raw_sample <= 8) {
             if (idct_algo == FF_IDCT_AUTO || idct_algo == FF_IDCT_SIMPLEMMX) {
                 c->idct_put              = ff_simple_idct_put_mmx;
                 c->idct_add              = ff_simple_idct_add_mmx;