pthread_frame: merge the functionality for normal decoder init and init_thread_copy

The current design, where
- proper init is called for the first per-thread context
- first thread's private data is copied into private data for all the
  other threads
- a "fixup" function is called for all the other threads to e.g.
  allocate dynamically allocated data
is very fragile and hard to follow, so it is abandoned. Instead, the
same init function is used to init each per-thread context. Where
necessary, AVCodecInternal.is_copy can be used to differentiate between
the first thread and the other ones (e.g. for decoding the extradata
just once).

38 files changed, 42 insertions, 483 deletions

diff --git a/doc/multithreading.txt b/doc/multithreading.txt
index 5b9dcb0bfc..4f645dc147 100644
--- a/doc/multithreading.txt
+++ b/doc/multithreading.txt
@@ -51,9 +51,6 @@ the decode process starts. Call ff_thread_finish_setup() afterwards. If
 some code can't be moved, have update_thread_context() run it in the next
 thread.
 
-If the codec allocates writable tables in its init(), add an init_thread_copy()
-which re-allocates them for other threads.
-
 Add AV_CODEC_CAP_FRAME_THREADS to the codec capabilities. There will be very little
 speed gain at this point but it should work.
 
diff --git a/libavcodec/aic.c b/libavcodec/aic.c
index 956d71fcff..f027fa99ef 100644
--- a/libavcodec/aic.c
+++ b/libavcodec/aic.c
@@ -504,6 +504,5 @@ AVCodec ff_aic_decoder = {
     .close          = aic_decode_close,
     .decode         = aic_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(aic_decode_init),
     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };
diff --git a/libavcodec/alac.c b/libavcodec/alac.c
index ea5ab182f9..c8c04223a0 100644
--- a/libavcodec/alac.c
+++ b/libavcodec/alac.c
@@ -601,15 +601,6 @@ static av_cold int alac_decode_init(AVCodecContext * avctx)
     return 0;
 }
 
-#if HAVE_THREADS
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    ALACContext *alac = avctx->priv_data;
-    alac->avctx = avctx;
-    return allocate_buffers(alac);
-}
-#endif
-
 static const AVOption options[] = {
     { "extra_bits_bug", "Force non-standard decoding process",
       offsetof(ALACContext, extra_bit_bug), AV_OPT_TYPE_BOOL, { .i64 = 0 },
@@ -633,7 +624,6 @@ AVCodec ff_alac_decoder = {
     .init           = alac_decode_init,
     .close          = alac_decode_close,
     .decode         = alac_decode_frame,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .priv_class     = &alac_class
 };
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 6da0d02a61..55151a0b71 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2635,12 +2635,6 @@ typedef struct AVCodec {
      * @{
      */
     /**
-     * If defined, called on thread contexts when they are created.
-     * If the codec allocates writable tables in init(), re-allocate them here.
-     * priv_data will be set to a copy of the original.
-     */
-    int (*init_thread_copy)(AVCodecContext *);
-    /**
      * Copy necessary context variables from a previous thread context to the current one.
      * If not defined, the next thread will start automatically; otherwise, the codec
      * must call ff_thread_finish_setup().
diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
index b4d6b25cbc..7956367b49 100644
--- a/libavcodec/cfhd.c
+++ b/libavcodec/cfhd.c
@@ -1039,10 +1039,8 @@ static av_cold int cfhd_close(AVCodecContext *avctx)
 
     free_buffers(s);
 
-    if (!avctx->internal->is_copy) {
-        ff_free_vlc(&s->vlc_9);
-        ff_free_vlc(&s->vlc_18);
-    }
+    ff_free_vlc(&s->vlc_9);
+    ff_free_vlc(&s->vlc_18);
 
     return 0;
 }
diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c
index af0f6da2e9..1f2c98ef73 100644
--- a/libavcodec/cllc.c
+++ b/libavcodec/cllc.c
@@ -483,19 +483,6 @@ static int cllc_decode_frame(AVCodecContext *avctx, void *data,
     return avpkt->size;
 }
 
-#if HAVE_THREADS
-static int cllc_init_thread_copy(AVCodecContext *avctx)
-{
-    CLLCContext *ctx = avctx->priv_data;
-
-    ctx->avctx            = avctx;
-    ctx->swapped_buf      = NULL;
-    ctx->swapped_buf_size = 0;
-
-    return 0;
-}
-#endif
-
 static av_cold int cllc_decode_close(AVCodecContext *avctx)
 {
     CLLCContext *ctx = avctx->priv_data;
@@ -526,7 +513,6 @@ AVCodec ff_cllc_decoder = {
     .id             = AV_CODEC_ID_CLLC,
     .priv_data_size = sizeof(CLLCContext),
     .init           = cllc_decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(cllc_init_thread_copy),
     .decode         = cllc_decode_frame,
     .close          = cllc_decode_close,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
index f7585458b9..e5d01e2e71 100644
--- a/libavcodec/dnxhddec.c
+++ b/libavcodec/dnxhddec.c
@@ -144,21 +144,6 @@ static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid, int bitdepth)
     return 0;
 }
 
-static av_cold int dnxhd_decode_init_thread_copy(AVCodecContext *avctx)
-{
-    DNXHDContext *ctx = avctx->priv_data;
-
-    ctx->avctx = avctx;
-    // make sure VLC tables will be loaded when cid is parsed
-    ctx->cid = -1;
-
-    ctx->rows = av_mallocz_array(avctx->thread_count, sizeof(RowContext));
-    if (!ctx->rows)
-        return AVERROR(ENOMEM);
-
-    return 0;
-}
-
 static int dnxhd_get_profile(int cid)
 {
     switch(cid) {
@@ -740,6 +725,5 @@ AVCodec ff_dnxhd_decoder = {
     .decode         = dnxhd_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
                       AV_CODEC_CAP_SLICE_THREADS,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(dnxhd_decode_init_thread_copy),
     .profiles       = NULL_IF_CONFIG_SMALL(ff_dnxhd_profiles),
 };
diff --git a/libavcodec/exr.c b/libavcodec/exr.c
index 1db30a1ae0..73419eadb1 100644
--- a/libavcodec/exr.c
+++ b/libavcodec/exr.c
@@ -1863,20 +1863,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-#if HAVE_THREADS
-static int decode_init_thread_copy(AVCodecContext *avctx)
-{
-    EXRContext *s = avctx->priv_data;
-
-    // allocate thread data, used for non EXR_RAW compression types
-    s->thread_data = av_mallocz_array(avctx->thread_count, sizeof(EXRThreadData));
-    if (!s->thread_data)
-        return AVERROR_INVALIDDATA;
-
-    return 0;
-}
-#endif
-
 static av_cold int decode_end(AVCodecContext *avctx)
 {
     EXRContext *s = avctx->priv_data;
@@ -1956,7 +1942,6 @@ AVCodec ff_exr_decoder = {
     .id               = AV_CODEC_ID_EXR,
     .priv_data_size   = sizeof(EXRContext),
     .init             = decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
     .close            = decode_end,
     .decode           = decode_frame,
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 2ffd3ef991..c704373cfe 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -977,34 +977,6 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac
     return buf_size;
 }
 
-#if HAVE_THREADS
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    FFV1Context *f = avctx->priv_data;
-    int i, ret;
-
-    f->picture.f      = NULL;
-    f->last_picture.f = NULL;
-    f->sample_buffer  = NULL;
-    f->max_slice_count = 0;
-    f->slice_count = 0;
-
-    for (i = 0; i < f->quant_table_count; i++) {
-        av_assert0(f->version > 1);
-        f->initial_states[i] = av_memdup(f->initial_states[i],
-                                         f->context_count[i] * sizeof(*f->initial_states[i]));
-    }
-
-    f->picture.f      = av_frame_alloc();
-    f->last_picture.f = av_frame_alloc();
-
-    if ((ret = ff_ffv1_init_slice_contexts(f)) < 0)
-        return ret;
-
-    return 0;
-}
-#endif
-
 static void copy_fields(FFV1Context *fsdst, FFV1Context *fssrc, FFV1Context *fsrc)
 {
     fsdst->version             = fsrc->version;
@@ -1088,7 +1060,6 @@ AVCodec ff_ffv1_decoder = {
     .init           = decode_init,
     .close          = ff_ffv1_close,
     .decode         = decode_frame,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |
                       AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,
diff --git a/libavcodec/flacdec.c b/libavcodec/flacdec.c
index c8eb456049..fb27e8e6d4 100644
--- a/libavcodec/flacdec.c
+++ b/libavcodec/flacdec.c
@@ -639,19 +639,6 @@ static int flac_decode_frame(AVCodecContext *avctx, void *data,
     return bytes_read;
 }
 
-#if HAVE_THREADS
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    FLACContext *s = avctx->priv_data;
-    s->decoded_buffer = NULL;
-    s->decoded_buffer_size = 0;
-    s->avctx = avctx;
-    if (s->flac_stream_info.max_blocksize)
-        return allocate_buffers(s);
-    return 0;
-}
-#endif
-
 static av_cold int flac_decode_close(AVCodecContext *avctx)
 {
     FLACContext *s = avctx->priv_data;
@@ -682,7 +669,6 @@ AVCodec ff_flac_decoder = {
     .init           = flac_decode_init,
     .close          = flac_decode_close,
     .decode         = flac_decode_frame,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
                                                       AV_SAMPLE_FMT_S16P,
diff --git a/libavcodec/h264dec.c b/libavcodec/h264dec.c
index defe514828..b6c51ed1e2 100644
--- a/libavcodec/h264dec.c
+++ b/libavcodec/h264dec.c
@@ -409,13 +409,15 @@ static av_cold int h264_decode_init(AVCodecContext *avctx)
     }
     avctx->ticks_per_frame = 2;
 
-    if (avctx->extradata_size > 0 && avctx->extradata) {
-        ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
-                                       &h->ps, &h->is_avc, &h->nal_length_size,
-                                       avctx->err_recognition, avctx);
-        if (ret < 0) {
-            h264_decode_end(avctx);
-            return ret;
+    if (!avctx->internal->is_copy) {
+        if (avctx->extradata_size > 0 && avctx->extradata) {
+            ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
+                                           &h->ps, &h->is_avc, &h->nal_length_size,
+                                           avctx->err_recognition, avctx);
+            if (ret < 0) {
+                h264_decode_end(avctx);
+                return ret;
+            }
         }
     }
 
@@ -438,27 +440,6 @@ static av_cold int h264_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-#if HAVE_THREADS
-static int decode_init_thread_copy(AVCodecContext *avctx)
-{
-    H264Context *h = avctx->priv_data;
-    int ret;
-
-    if (!avctx->internal->is_copy)
-        return 0;
-
-    memset(h, 0, sizeof(*h));
-
-    ret = h264_init_context(avctx, h);
-    if (ret < 0)
-        return ret;
-
-    h->context_initialized = 0;
-
-    return 0;
-}
-#endif
-
 /**
  * instantaneous decoder refresh.
  */
@@ -1081,7 +1062,6 @@ AVCodec ff_h264_decoder = {
     .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_EXPORTS_CROPPING |
                              FF_CODEC_CAP_ALLOCATE_PROGRESS,
     .flush                 = flush_dpb,
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
     .profiles              = NULL_IF_CONFIG_SMALL(ff_h264_profiles),
     .priv_class            = &h264_class,
diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index 58689a4370..36be83948e 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -3506,11 +3506,13 @@ static av_cold int hevc_decode_init(AVCodecContext *avctx)
     else
         s->threads_number = 1;
 
-    if (avctx->extradata_size > 0 && avctx->extradata) {
-        ret = hevc_decode_extradata(s, avctx->extradata, avctx->extradata_size, 1);
-        if (ret < 0) {
-            hevc_decode_free(avctx);
-            return ret;
+    if (!avctx->internal->is_copy) {
+        if (avctx->extradata_size > 0 && avctx->extradata) {
+            ret = hevc_decode_extradata(s, avctx->extradata, avctx->extradata_size, 1);
+            if (ret < 0) {
+                hevc_decode_free(avctx);
+                return ret;
+            }
         }
     }
 
@@ -3522,22 +3524,6 @@ static av_cold int hevc_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-#if HAVE_THREADS
-static av_cold int hevc_init_thread_copy(AVCodecContext *avctx)
-{
-    HEVCContext *s = avctx->priv_data;
-    int ret;
-
-    memset(s, 0, sizeof(*s));
-
-    ret = hevc_init_context(avctx);
-    if (ret < 0)
-        return ret;
-
-    return 0;
-}
-#endif
-
 static void hevc_decode_flush(AVCodecContext *avctx)
 {
     HEVCContext *s = avctx->priv_data;
@@ -3577,7 +3563,6 @@ AVCodec ff_hevc_decoder = {
     .decode                = hevc_decode_frame,
     .flush                 = hevc_decode_flush,
     .update_thread_context = ONLY_IF_THREADS_ENABLED(hevc_update_thread_context),
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(hevc_init_thread_copy),
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
                              AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
     .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_EXPORTS_CROPPING |
diff --git a/libavcodec/hqx.c b/libavcodec/hqx.c
index 39404d24e5..e2b895ac40 100644
--- a/libavcodec/hqx.c
+++ b/libavcodec/hqx.c
@@ -520,9 +520,6 @@ static av_cold int hqx_decode_close(AVCodecContext *avctx)
     int i;
     HQXContext *ctx = avctx->priv_data;
 
-    if (avctx->internal->is_copy)
-        return 0;
-
     ff_free_vlc(&ctx->cbp_vlc);
     for (i = 0; i < 3; i++) {
         ff_free_vlc(&ctx->dc_vlc[i]);
diff --git a/libavcodec/huffyuvdec.c b/libavcodec/huffyuvdec.c
index 46dcfa8235..0ee7ec3917 100644
--- a/libavcodec/huffyuvdec.c
+++ b/libavcodec/huffyuvdec.c
@@ -570,35 +570,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
     return ret;
 }
 
-#if HAVE_THREADS
-static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
-{
-    HYuvContext *s = avctx->priv_data;
-    int i, ret;
-
-    s->avctx = avctx;
-
-    if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {
-        ff_huffyuv_common_end(s);
-        return ret;
-    }
-
-    for (i = 0; i < 8; i++)
-        s->vlc[i].table = NULL;
-
-    if (s->version >= 2) {
-        if ((ret = read_huffman_tables(s, avctx->extradata + 4,
-                                       avctx->extradata_size)) < 0)
-            return ret;
-    } else {
-        if ((ret = read_old_huffman_tables(s)) < 0)
-            return ret;
-    }
-
-    return 0;
-}
-#endif
-
 /** Subset of GET_VLC for use in hand-roller VLC code */
 #define VLC_INTERN(dst, table, gb, name, bits, max_depth)   \
     code = table[index][0];                                 \
@@ -1302,7 +1273,6 @@ AVCodec ff_huffyuv_decoder = {
     .decode           = decode_frame,
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                         AV_CODEC_CAP_FRAME_THREADS,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
 };
 
 #if CONFIG_FFVHUFF_DECODER
@@ -1317,7 +1287,6 @@ AVCodec ff_ffvhuff_decoder = {
     .decode           = decode_frame,
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                         AV_CODEC_CAP_FRAME_THREADS,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
 };
 #endif /* CONFIG_FFVHUFF_DECODER */
 
@@ -1333,6 +1302,5 @@ AVCodec ff_hymt_decoder = {
     .decode           = decode_frame,
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                         AV_CODEC_CAP_FRAME_THREADS,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
 };
 #endif /* CONFIG_HYMT_DECODER */
diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c
index 0a45812bc1..d81e55cf4c 100644
--- a/libavcodec/lagarith.c
+++ b/libavcodec/lagarith.c
@@ -712,16 +712,6 @@ static av_cold int lag_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-#if HAVE_THREADS
-static av_cold int lag_decode_init_thread_copy(AVCodecContext *avctx)
-{
-    LagarithContext *l = avctx->priv_data;
-    l->avctx = avctx;
-
-    return 0;
-}
-#endif
-
 AVCodec ff_lagarith_decoder = {
     .name           = "lagarith",
     .long_name      = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
@@ -729,7 +719,6 @@ AVCodec ff_lagarith_decoder = {
     .id             = AV_CODEC_ID_LAGARITH,
     .priv_data_size = sizeof(LagarithContext),
     .init           = lag_decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(lag_decode_init_thread_copy),
     .decode         = lag_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
 };
diff --git a/libavcodec/lcldec.c b/libavcodec/lcldec.c
index 046cdc4f8e..c51083bdf2 100644
--- a/libavcodec/lcldec.c
+++ b/libavcodec/lcldec.c
@@ -622,13 +622,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-#if HAVE_THREADS
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    return decode_init(avctx);
-}
-#endif
-
 static av_cold int decode_end(AVCodecContext *avctx)
 {
     LclDecContext * const c = avctx->priv_data;
@@ -650,7 +643,6 @@ AVCodec ff_mszh_decoder = {
     .id             = AV_CODEC_ID_MSZH,
     .priv_data_size = sizeof(LclDecContext),
     .init           = decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
@@ -666,7 +658,6 @@ AVCodec ff_zlib_decoder = {
     .id             = AV_CODEC_ID_ZLIB,
     .priv_data_size = sizeof(LclDecContext),
     .init           = decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
diff --git a/libavcodec/magicyuv.c b/libavcodec/magicyuv.c
index aacd0d4d7d..5d76274d54 100644
--- a/libavcodec/magicyuv.c
+++ b/libavcodec/magicyuv.c
@@ -749,21 +749,6 @@ static int magy_decode_frame(AVCodecContext *avctx, void *data,
     return avpkt->size;
 }
 
-#if HAVE_THREADS
-static int magy_init_thread_copy(AVCodecContext *avctx)
-{
-    MagicYUVContext *s = avctx->priv_data;
-    int i;
-
-    for (i = 0; i < FF_ARRAY_ELEMS(s->slices); i++) {
-        s->slices[i] = NULL;
-        s->slices_size[i] = 0;
-    }
-
-    return 0;
-}
-#endif
-
 static av_cold int magy_decode_init(AVCodecContext *avctx)
 {
     MagicYUVContext *s = avctx->priv_data;
@@ -792,7 +777,6 @@ AVCodec ff_magicyuv_decoder = {
     .id               = AV_CODEC_ID_MAGICYUV,
     .priv_data_size   = sizeof(MagicYUVContext),
     .init             = magy_decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(magy_init_thread_copy),
     .close            = magy_decode_end,
     .decode           = magy_decode_frame,
     .capabilities     = AV_CODEC_CAP_DR1 |
diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c
index 330b761279..7e34ec568e 100644
--- a/libavcodec/mdec.c
+++ b/libavcodec/mdec.c
@@ -240,17 +240,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-#if HAVE_THREADS
-static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
-{
-    MDECContext * const a = avctx->priv_data;
-
-    a->avctx           = avctx;
-
-    return 0;
-}
-#endif
-
 static av_cold int decode_end(AVCodecContext *avctx)
 {
     MDECContext * const a = avctx->priv_data;
@@ -271,5 +260,4 @@ AVCodec ff_mdec_decoder = {
     .close            = decode_end,
     .decode           = decode_frame,
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy)
 };
diff --git a/libavcodec/mimic.c b/libavcodec/mimic.c
index 8e3a77a334..2563a49d53 100644
--- a/libavcodec/mimic.c
+++ b/libavcodec/mimic.c
@@ -128,8 +128,7 @@ static av_cold int mimic_decode_end(AVCodecContext *avctx)
         av_frame_free(&ctx->frames[i].f);
     }
 
-    if (!avctx->internal->is_copy)
-        ff_free_vlc(&ctx->vlc);
+    ff_free_vlc(&ctx->vlc);
 
     return 0;
 }
@@ -449,24 +448,6 @@ static int mimic_decode_frame(AVCodecContext *avctx, void *data,
     return buf_size;
 }
 
-#if HAVE_THREADS
-static av_cold int mimic_init_thread_copy(AVCodecContext *avctx)
-{
-    MimicContext *ctx = avctx->priv_data;
-    int i;
-
-    for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
-        ctx->frames[i].f = av_frame_alloc();
-        if (!ctx->frames[i].f) {
-            mimic_decode_end(avctx);
-            return AVERROR(ENOMEM);
-        }
-    }
-
-    return 0;
-}
-#endif
-
 AVCodec ff_mimic_decoder = {
     .name                  = "mimic",
     .long_name             = NULL_IF_CONFIG_SMALL("Mimic"),
@@ -478,6 +459,5 @@ AVCodec ff_mimic_decoder = {
     .decode                = mimic_decode_frame,
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context),
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(mimic_init_thread_copy),
     .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS,
 };
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index de35b330ad..bfb1f92b33 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -3559,13 +3559,11 @@ static av_cold int decode_end(AVCodecContext *avctx)
     Mpeg4DecContext *ctx = avctx->priv_data;
     int i;
 
-    if (!avctx->internal->is_copy) {
-        for (i = 0; i < 12; i++)
-            ff_free_vlc(&ctx->studio_intra_tab[i]);
+    for (i = 0; i < 12; i++)
+        ff_free_vlc(&ctx->studio_intra_tab[i]);
 
-        ff_free_vlc(&ctx->studio_luma_dc);
-        ff_free_vlc(&ctx->studio_chroma_dc);
-    }
+    ff_free_vlc(&ctx->studio_luma_dc);
+    ff_free_vlc(&ctx->studio_chroma_dc);
 
     return ff_h263_decode_end(avctx);
 }
diff --git a/libavcodec/pixlet.c b/libavcodec/pixlet.c
index 03a2cdacc8..7b068b1ce5 100644
--- a/libavcodec/pixlet.c
+++ b/libavcodec/pixlet.c
@@ -675,28 +675,12 @@ static int pixlet_decode_frame(AVCodecContext *avctx, void *data,
     return pktsize;
 }
 
-#if HAVE_THREADS
-static int pixlet_init_thread_copy(AVCodecContext *avctx)
-{
-    PixletContext *ctx = avctx->priv_data;
-
-    ctx->filter[0]  = NULL;
-    ctx->filter[1]  = NULL;
-    ctx->prediction = NULL;
-    ctx->w = 0;
-    ctx->h = 0;
-
-    return 0;
-}
-#endif /* HAVE_THREADS */
-
 AVCodec ff_pixlet_decoder = {
     .name             = "pixlet",
     .long_name        = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
     .type             = AVMEDIA_TYPE_VIDEO,
     .id               = AV_CODEC_ID_PIXLET,
     .init             = pixlet_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(pixlet_init_thread_copy),
     .close            = pixlet_close,
     .decode           = pixlet_decode_frame,
     .priv_data_size   = sizeof(PixletContext),
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index af8608b23b..7e2c19bd57 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -1771,9 +1771,7 @@ static av_cold int png_dec_init(AVCodecContext *avctx)
         return AVERROR(ENOMEM);
     }
 
-    if (!avctx->internal->is_copy) {
-        ff_pngdsp_init(&s->dsp);
-    }
+    ff_pngdsp_init(&s->dsp);
 
     return 0;
 }
@@ -1808,7 +1806,6 @@ AVCodec ff_apng_decoder = {
     .init           = png_dec_init,
     .close          = png_dec_end,
     .decode         = decode_frame_apng,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(png_dec_init),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
@@ -1826,7 +1823,6 @@ AVCodec ff_png_decoder = {
     .init           = png_dec_init,
     .close          = png_dec_end,
     .decode         = decode_frame_png,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(png_dec_init),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_THREADSAFE |
diff --git a/libavcodec/proresdec2.c b/libavcodec/proresdec2.c
index 2652a31c81..d5fbfc6711 100644
--- a/libavcodec/proresdec2.c
+++ b/libavcodec/proresdec2.c
@@ -807,17 +807,6 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     return avpkt->size;
 }
 
-#if HAVE_THREADS
-static int decode_init_thread_copy(AVCodecContext *avctx)
-{
-    ProresContext *ctx = avctx->priv_data;
-
-    ctx->slices = NULL;
-
-    return 0;
-}
-#endif
-
 static av_cold int decode_close(AVCodecContext *avctx)
 {
     ProresContext *ctx = avctx->priv_data;
@@ -834,7 +823,6 @@ AVCodec ff_prores_decoder = {
     .id             = AV_CODEC_ID_PRORES,
     .priv_data_size = sizeof(ProresContext),
     .init           = decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
     .close          = decode_close,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
index f078790737..69671c90fb 100644
--- a/libavcodec/pthread_frame.c
+++ b/libavcodec/pthread_frame.c
@@ -703,7 +703,10 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
         av_freep(&p->released_buffers);
 
         if (i && p->avctx) {
+            if (codec->priv_class)
+                av_opt_free(p->avctx->priv_data);
             av_freep(&p->avctx->priv_data);
+
             av_freep(&p->avctx->slice_offset);
         }
 
@@ -809,28 +812,30 @@ int ff_frame_thread_init(AVCodecContext *avctx)
         copy->internal->thread_ctx = p;
         copy->internal->last_pkt_props = &p->avpkt;
 
-        if (!i) {
-            src = copy;
-
-            if (codec->init)
-                err = codec->init(copy);
-
-            update_context_from_thread(avctx, copy, 1);
-        } else {
-            copy->priv_data = av_malloc(codec->priv_data_size);
+        if (i) {
+            copy->priv_data = av_mallocz(codec->priv_data_size);
             if (!copy->priv_data) {
                 err = AVERROR(ENOMEM);
                 goto error;
             }
-            memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
-            copy->internal->is_copy = 1;
 
-            if (codec->init_thread_copy)
-                err = codec->init_thread_copy(copy);
+            if (codec->priv_class) {
+                *(const AVClass **)copy->priv_data = codec->priv_class;
+                err = av_opt_copy(copy->priv_data, src->priv_data);
+                if (err < 0)
+                    goto error;
+            }
+            copy->internal->is_copy = 1;
         }
 
+        if (codec->init)
+            err = codec->init(copy);
+
         if (err) goto error;
 
+        if (!i)
+            update_context_from_thread(avctx, copy, 1);
+
         atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0);
 
         err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
diff --git a/libavcodec/rv30.c b/libavcodec/rv30.c
index 0a63352e6b..36cd5345fd 100644
--- a/libavcodec/rv30.c
+++ b/libavcodec/rv30.c
@@ -304,7 +304,6 @@ AVCodec ff_rv30_decoder = {
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_NONE
     },
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
     .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS,
 };
diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
index f877258db6..ec0cd27916 100644
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@@ -1529,34 +1529,6 @@ av_cold int ff_rv34_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)
-{
-    int err;
-    RV34DecContext *r = avctx->priv_data;
-
-    r->s.avctx = avctx;
-
-    if (avctx->internal->is_copy) {
-        r->tmp_b_block_base = NULL;
-        r->cbp_chroma       = NULL;
-        r->cbp_luma         = NULL;
-        r->deblock_coefs    = NULL;
-        r->intra_types_hist = NULL;
-        r->mb_type          = NULL;
-
-        ff_mpv_idct_init(&r->s);
-
-        if ((err = ff_mpv_common_init(&r->s)) < 0)
-            return err;
-        if ((err = rv34_decoder_alloc(r)) < 0) {
-            ff_mpv_common_end(&r->s);
-            return err;
-        }
-    }
-
-    return 0;
-}
-
 int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
 {
     RV34DecContext *r = dst->priv_data, *r1 = src->priv_data;
diff --git a/libavcodec/rv34.h b/libavcodec/rv34.h
index efff94a1d9..1d5522538b 100644
--- a/libavcodec/rv34.h
+++ b/libavcodec/rv34.h
@@ -136,7 +136,6 @@ int ff_rv34_get_start_offset(GetBitContext *gb, int blocks);
 int ff_rv34_decode_init(AVCodecContext *avctx);
 int ff_rv34_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt);
 int ff_rv34_decode_end(AVCodecContext *avctx);
-int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx);
 int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
 
 #endif /* AVCODEC_RV34_H */
diff --git a/libavcodec/rv40.c b/libavcodec/rv40.c
index ad15044ee3..462024c81e 100644
--- a/libavcodec/rv40.c
+++ b/libavcodec/rv40.c
@@ -583,7 +583,6 @@ AVCodec ff_rv40_decoder = {
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_NONE
     },
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
     .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS,
 };
diff --git a/libavcodec/sheervideo.c b/libavcodec/sheervideo.c
index 50c3ebcee7..1a43727a30 100644
--- a/libavcodec/sheervideo.c
+++ b/libavcodec/sheervideo.c
@@ -2063,19 +2063,6 @@ static int decode_frame(AVCodecContext *avctx,
     return avpkt->size;
 }
 
-#if HAVE_THREADS
-static int decode_init_thread_copy(AVCodecContext *avctx)
-{
-    SheerVideoContext *s = avctx->priv_data;
-
-    s->format = 0;
-    memset(&s->vlc[0], 0, sizeof(s->vlc[0]));
-    memset(&s->vlc[1], 0, sizeof(s->vlc[1]));
-
-    return 0;
-}
-#endif
-
 static av_cold int decode_end(AVCodecContext *avctx)
 {
     SheerVideoContext *s = avctx->priv_data;
@@ -2092,7 +2079,6 @@ AVCodec ff_sheervideo_decoder = {
     .type             = AVMEDIA_TYPE_VIDEO,
     .id               = AV_CODEC_ID_SHEERVIDEO,
     .priv_data_size   = sizeof(SheerVideoContext),
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
     .close            = decode_end,
     .decode           = decode_frame,
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
diff --git a/libavcodec/takdec.c b/libavcodec/takdec.c
index 8ec87ab509..9fa1cb1f7f 100644
--- a/libavcodec/takdec.c
+++ b/libavcodec/takdec.c
@@ -915,13 +915,6 @@ static int tak_decode_frame(AVCodecContext *avctx, void *data,
 }
 
 #if HAVE_THREADS
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    TAKDecContext *s = avctx->priv_data;
-    s->avctx = avctx;
-    return 0;
-}
-
 static int update_thread_context(AVCodecContext *dst,
                                  const AVCodecContext *src)
 {
@@ -953,7 +946,6 @@ AVCodec ff_tak_decoder = {
     .init             = tak_decode_init,
     .close            = tak_decode_close,
     .decode           = tak_decode_frame,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .sample_fmts      = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index e8357114de..3b5985ed1e 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -2165,7 +2165,6 @@ AVCodec ff_tiff_decoder = {
     .init           = tiff_init,
     .close          = tiff_end,
     .decode         = decode_frame,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(tiff_init),
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
     .priv_class     = &tiff_decoder_class,
diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index 3fbee06987..e68e4fbb36 100644
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -389,13 +389,6 @@ error:
     return ret;
 }
 
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    TTAContext *s = avctx->priv_data;
-    s->avctx = avctx;
-    return allocate_buffers(avctx);
-}
-
 static av_cold int tta_decode_close(AVCodecContext *avctx) {
     TTAContext *s = avctx->priv_data;
 
@@ -430,7 +423,6 @@ AVCodec ff_tta_decoder = {
     .init           = tta_decode_init,
     .close          = tta_decode_close,
     .decode         = tta_decode_frame,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .priv_class     = &tta_decoder_class,
 };
diff --git a/libavcodec/vble.c b/libavcodec/vble.c
index c25ee98697..c48c13127a 100644
--- a/libavcodec/vble.c
+++ b/libavcodec/vble.c
@@ -214,6 +214,5 @@ AVCodec ff_vble_decoder = {
     .close          = vble_decode_close,
     .decode         = vble_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(vble_decode_init),
     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index b80a2e1c9d..c45bed8f85 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -347,9 +347,6 @@ static av_cold int vp3_decode_end(AVCodecContext *avctx)
     av_frame_free(&s->last_frame.f);
     av_frame_free(&s->golden_frame.f);
 
-    if (avctx->internal->is_copy)
-        return 0;
-
     for (i = 0; i < 16; i++) {
         ff_free_vlc(&s->dc_vlc[i]);
         ff_free_vlc(&s->ac_vlc_1[i]);
@@ -2601,23 +2598,6 @@ static int vp3_update_thread_context(AVCodecContext *dst, const AVCodecContext *
     }
 
     if (s != s1) {
-        if (!s->current_frame.f)
-            return AVERROR(ENOMEM);
-        // init tables if the first frame hasn't been decoded
-        if (!s->current_frame.f->data[0]) {
-            int y_fragment_count, c_fragment_count;
-            s->avctx = dst;
-            err = allocate_tables(dst);
-            if (err)
-                return err;
-            y_fragment_count = s->fragment_width[0] * s->fragment_height[0];
-            c_fragment_count = s->fragment_width[1] * s->fragment_height[1];
-            memcpy(s->motion_val[0], s1->motion_val[0],
-                   y_fragment_count * sizeof(*s->motion_val[0]));
-            memcpy(s->motion_val[1], s1->motion_val[1],
-                   c_fragment_count * sizeof(*s->motion_val[1]));
-        }
-
         // copy previous frame data
         if ((err = ref_frames(s, s1)) < 0)
             return err;
@@ -2927,28 +2907,6 @@ static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb)
     return 0;
 }
 
-#if HAVE_THREADS
-static int vp3_init_thread_copy(AVCodecContext *avctx)
-{
-    Vp3DecodeContext *s = avctx->priv_data;
-
-    s->superblock_coding      = NULL;
-    s->all_fragments          = NULL;
-    s->coded_fragment_list[0] = NULL;
-    s-> kf_coded_fragment_list= NULL;
-    s->nkf_coded_fragment_list= NULL;
-    s->dct_tokens_base        = NULL;
-    s->superblock_fragments   = NULL;
-    s->macroblock_coding      = NULL;
-    s->motion_val[0]          = NULL;
-    s->motion_val[1]          = NULL;
-    s->edge_emu_buffer        = NULL;
-    s->dc_pred_row            = NULL;
-
-    return init_frames(s);
-}
-#endif
-
 #if CONFIG_THEORA_DECODER
 static const enum AVPixelFormat theora_pix_fmts[4] = {
     AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P
@@ -3262,7 +3220,6 @@ AVCodec ff_theora_decoder = {
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                              AV_CODEC_CAP_FRAME_THREADS,
     .flush                 = vp3_decode_flush,
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp3_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(vp3_update_thread_context),
     .caps_internal         = FF_CODEC_CAP_EXPORTS_CROPPING | FF_CODEC_CAP_ALLOCATE_PROGRESS,
 };
@@ -3280,7 +3237,6 @@ AVCodec ff_vp3_decoder = {
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                              AV_CODEC_CAP_FRAME_THREADS,
     .flush                 = vp3_decode_flush,
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp3_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(vp3_update_thread_context),
     .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS,
 };
@@ -3298,7 +3254,6 @@ AVCodec ff_vp4_decoder = {
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                              AV_CODEC_CAP_FRAME_THREADS,
     .flush                 = vp3_decode_flush,
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp3_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(vp3_update_thread_context),
     .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS,
 };
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 81da0422be..1794d6d031 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -2894,21 +2894,6 @@ av_cold int ff_vp8_decode_init(AVCodecContext *avctx)
 
 #if CONFIG_VP8_DECODER
 #if HAVE_THREADS
-static av_cold int vp8_decode_init_thread_copy(AVCodecContext *avctx)
-{
-    VP8Context *s = avctx->priv_data;
-    int ret;
-
-    s->avctx = avctx;
-
-    if ((ret = vp8_init_frames(s)) < 0) {
-        ff_vp8_decode_free(avctx);
-        return ret;
-    }
-
-    return 0;
-}
-
 #define REBASE(pic) ((pic) ? (pic) - &s_src->frames[0] + &s->frames[0] : NULL)
 
 static int vp8_decode_update_thread_context(AVCodecContext *dst,
@@ -2976,7 +2961,6 @@ AVCodec ff_vp8_decoder = {
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
                              AV_CODEC_CAP_SLICE_THREADS,
     .flush                 = vp8_decode_flush,
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp8_decode_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(vp8_decode_update_thread_context),
     .hw_configs            = (const AVCodecHWConfigInternal*[]) {
 #if CONFIG_VP8_VAAPI_HWACCEL
diff --git a/libavcodec/vp9.c b/libavcodec/vp9.c
index e47ed4e04e..2a3a4555b9 100644
--- a/libavcodec/vp9.c
+++ b/libavcodec/vp9.c
@@ -1748,11 +1748,6 @@ static av_cold int vp9_decode_init(AVCodecContext *avctx)
 }
 
 #if HAVE_THREADS
-static av_cold int vp9_decode_init_thread_copy(AVCodecContext *avctx)
-{
-    return init_frames(avctx);
-}
-
 static int vp9_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
 {
     int i, ret;
@@ -1812,7 +1807,6 @@ AVCodec ff_vp9_decoder = {
     .caps_internal         = FF_CODEC_CAP_SLICE_THREAD_HAS_MF |
                              FF_CODEC_CAP_ALLOCATE_PROGRESS,
     .flush                 = vp9_decode_flush,
-    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp9_decode_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(vp9_decode_update_thread_context),
     .profiles              = NULL_IF_CONFIG_SMALL(ff_vp9_profiles),
     .bsfs                  = "vp9_superframe_split",
diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 20884805ab..58ab561a15 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -1009,20 +1009,6 @@ static int wv_dsd_reset(WavpackContext *s, int channels)
 }
 
 #if HAVE_THREADS
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    WavpackContext *s = avctx->priv_data;
-    s->avctx = avctx;
-
-    s->curr_frame.f = av_frame_alloc();
-    s->prev_frame.f = av_frame_alloc();
-
-    if (!s->curr_frame.f || !s->prev_frame.f)
-        return AVERROR(ENOMEM);
-
-    return 0;
-}
-
 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
 {
     WavpackContext *fsrc = src->priv_data;
@@ -1714,7 +1700,6 @@ AVCodec ff_wavpack_decoder = {
     .close          = wavpack_decode_end,
     .decode         = wavpack_decode_frame,
     .flush          = wavpack_decode_flush,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
                       AV_CODEC_CAP_SLICE_THREADS,
diff --git a/libavcodec/ylc.c b/libavcodec/ylc.c
index 11333222b9..2afe3fc9d5 100644
--- a/libavcodec/ylc.c
+++ b/libavcodec/ylc.c
@@ -453,24 +453,6 @@ static int decode_frame(AVCodecContext *avctx,
     return avpkt->size;
 }
 
-#if HAVE_THREADS
-static int init_thread_copy(AVCodecContext *avctx)
-{
-    YLCContext *s = avctx->priv_data;
-
-    memset(&s->vlc[0], 0, sizeof(VLC));
-    memset(&s->vlc[1], 0, sizeof(VLC));
-    memset(&s->vlc[2], 0, sizeof(VLC));
-    memset(&s->vlc[3], 0, sizeof(VLC));
-    s->table_bits = NULL;
-    s->table_bits_size = 0;
-    s->bitstream_bits = NULL;
-    s->bitstream_bits_size = 0;
-
-    return 0;
-}
-#endif
-
 static av_cold int decode_end(AVCodecContext *avctx)
 {
     YLCContext *s = avctx->priv_data;
@@ -494,7 +476,6 @@ AVCodec ff_ylc_decoder = {
     .id             = AV_CODEC_ID_YLC,
     .priv_data_size = sizeof(YLCContext),
     .init           = decode_init,
-    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,