cosmetics: Write NULL pointer equality checks more compactly

Signed-off-by: Diego Biurrun <diego@biurrun.de>

53 files changed, 95 insertions, 97 deletions

diff --git a/avconv.c b/avconv.c
index 65f33b2d1e..634101a452 100644
--- a/avconv.c
+++ b/avconv.c
@@ -1363,7 +1363,7 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt)
     if (ist->next_dts == AV_NOPTS_VALUE)
         ist->next_dts = ist->last_dts;
 
-    if (pkt == NULL) {
+    if (!pkt) {
         /* EOF handling */
         av_init_packet(&avpkt);
         avpkt.data = NULL;
diff --git a/avconv_opt.c b/avconv_opt.c
index 434ba0b2e7..f070b99b1c 100644
--- a/avconv_opt.c
+++ b/avconv_opt.c
@@ -587,7 +587,7 @@ static void assert_file_overwrite(const char *filename)
     }
 
     if (!file_overwrite &&
-        (strchr(filename, ':') == NULL || filename[1] == ':' ||
+        (!strchr(filename, ':') || filename[1] == ':' ||
          av_strstart(filename, "file:", NULL))) {
         if (avio_check(filename, 0) == 0) {
             if (!using_stdin && !file_skip) {
diff --git a/avplay.c b/avplay.c
index 2db892849b..816733fe43 100644
--- a/avplay.c
+++ b/avplay.c
@@ -1388,7 +1388,7 @@ static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, int64_t
         is->img_convert_ctx = sws_getCachedContext(is->img_convert_ctx,
             vp->width, vp->height, vp->pix_fmt, vp->width, vp->height,
             dst_pix_fmt, sws_flags, NULL, NULL, NULL);
-        if (is->img_convert_ctx == NULL) {
+        if (!is->img_convert_ctx) {
             fprintf(stderr, "Cannot initialize the conversion context\n");
             exit(1);
         }
diff --git a/cmdutils.c b/cmdutils.c
index b208e52d68..b1671a49f5 100644
--- a/cmdutils.c
+++ b/cmdutils.c
@@ -225,7 +225,7 @@ static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
 
     win32_argv_utf8 = av_mallocz(sizeof(char *) * (win32_argc + 1) + buffsize);
     argstr_flat     = (char *)win32_argv_utf8 + sizeof(char *) * (win32_argc + 1);
-    if (win32_argv_utf8 == NULL) {
+    if (!win32_argv_utf8) {
         LocalFree(argv_w);
         return;
     }
@@ -920,7 +920,7 @@ int show_formats(void *optctx, const char *opt, const char *arg)
         const char *long_name = NULL;
 
         while ((ofmt = av_oformat_next(ofmt))) {
-            if ((name == NULL || strcmp(ofmt->name, name) < 0) &&
+            if ((!name || strcmp(ofmt->name, name) < 0) &&
                 strcmp(ofmt->name, last_name) > 0) {
                 name      = ofmt->name;
                 long_name = ofmt->long_name;
@@ -928,7 +928,7 @@ int show_formats(void *optctx, const char *opt, const char *arg)
             }
         }
         while ((ifmt = av_iformat_next(ifmt))) {
-            if ((name == NULL || strcmp(ifmt->name, name) < 0) &&
+            if ((!name || strcmp(ifmt->name, name) < 0) &&
                 strcmp(ifmt->name, last_name) > 0) {
                 name      = ifmt->name;
                 long_name = ifmt->long_name;
@@ -937,7 +937,7 @@ int show_formats(void *optctx, const char *opt, const char *arg)
             if (name && strcmp(ifmt->name, name) == 0)
                 decode = 1;
         }
-        if (name == NULL)
+        if (!name)
             break;
         last_name = name;
 
diff --git a/compat/getopt.c b/compat/getopt.c
index 7c646f6a05..b7adf60e2f 100644
--- a/compat/getopt.c
+++ b/compat/getopt.c
@@ -53,7 +53,7 @@ static int getopt(int argc, char *argv[], char *opts)
             return EOF;
         }
     optopt = c = argv[optind][sp];
-    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
+    if (c == ':' || !(cp = strchr(opts, c))) {
         fprintf(stderr, ": illegal option -- %c\n", c);
         if (argv[optind][++sp] == '\0') {
             optind++;
diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c
index 76fd0d141d..31f484464e 100644
--- a/libavcodec/atrac3.c
+++ b/libavcodec/atrac3.c
@@ -882,7 +882,7 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx)
 
     q->decoded_bytes_buffer = av_mallocz(FFALIGN(avctx->block_align, 4) +
                                          FF_INPUT_BUFFER_PADDING_SIZE);
-    if (q->decoded_bytes_buffer == NULL)
+    if (!q->decoded_bytes_buffer)
         return AVERROR(ENOMEM);
 
     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
diff --git a/libavcodec/cook.c b/libavcodec/cook.c
index 2d77899c55..056c7d90f6 100644
--- a/libavcodec/cook.c
+++ b/libavcodec/cook.c
@@ -1218,7 +1218,7 @@ static av_cold int cook_decode_init(AVCodecContext *avctx)
         av_mallocz(avctx->block_align
                    + DECODE_BYTES_PAD1(avctx->block_align)
                    + FF_INPUT_BUFFER_PADDING_SIZE);
-    if (q->decoded_bytes_buffer == NULL)
+    if (!q->decoded_bytes_buffer)
         return AVERROR(ENOMEM);
 
     /* Initialize transform. */
diff --git a/libavcodec/dvbsub.c b/libavcodec/dvbsub.c
index de0808fff5..720e78669a 100644
--- a/libavcodec/dvbsub.c
+++ b/libavcodec/dvbsub.c
@@ -205,7 +205,7 @@ static int encode_dvb_subtitles(DVBSubtitleContext *s,
 
     page_id = 1;
 
-    if (h->num_rects == 0 || h->rects == NULL)
+    if (h->num_rects == 0 || !h->rects)
         return -1;
 
     *q++ = 0x00; /* subtitle_stream_id */
diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index 02f70be906..856d666b04 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -360,7 +360,7 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
     if (sub_header->num_rects > 0)
         return is_menu;
  fail:
-    if (sub_header->rects != NULL) {
+    if (!sub_header->rects) {
         for (i = 0; i < sub_header->num_rects; i++) {
             av_freep(&sub_header->rects[i]->pict.data[0]);
             av_freep(&sub_header->rects[i]->pict.data[1]);
@@ -391,7 +391,7 @@ static int find_smallest_bounding_rectangle(AVSubtitle *s)
     int y1, y2, x1, x2, y, w, h, i;
     uint8_t *bitmap;
 
-    if (s->num_rects == 0 || s->rects == NULL || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
+    if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
         return 0;
 
     for(i = 0; i < s->rects[0]->nb_colors; i++) {
diff --git a/libavcodec/dvdsubenc.c b/libavcodec/dvdsubenc.c
index db6749e59d..f62e943e7f 100644
--- a/libavcodec/dvdsubenc.c
+++ b/libavcodec/dvdsubenc.c
@@ -97,7 +97,7 @@ static int encode_dvd_subtitles(uint8_t *outbuf, int outbuf_size,
     unsigned long hist[256];
     int           cmap[256];
 
-    if (rects == 0 || h->rects == NULL)
+    if (rects == 0 || !h->rects)
         return -1;
     if (rects > 20)
         rects = 20;
diff --git a/libavcodec/dxa.c b/libavcodec/dxa.c
index fa0677d34c..989fcb965b 100644
--- a/libavcodec/dxa.c
+++ b/libavcodec/dxa.c
@@ -309,7 +309,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     avctx->pix_fmt = AV_PIX_FMT_PAL8;
 
     c->dsize = avctx->width * avctx->height * 2;
-    if((c->decomp_buf = av_malloc(c->dsize)) == NULL) {
+    if (!(c->decomp_buf = av_malloc(c->dsize))) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
         return AVERROR(ENOMEM);
     }
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index a9cdb9e37d..e7ce56c699 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -457,7 +457,7 @@ int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
         if ((ret = ff_mpv_common_init(s)) < 0)
             return ret;
 
-    if (s->current_picture_ptr == NULL || s->current_picture_ptr->f->data[0]) {
+    if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
         int i = ff_find_unused_picture(s, 0);
         if (i < 0)
             return i;
@@ -517,7 +517,7 @@ int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 
     /* skip B-frames if we don't have reference frames */
-    if (s->last_picture_ptr == NULL &&
+    if (!s->last_picture_ptr &&
         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
         return get_consumed_bytes(s, buf_size);
     if ((avctx->skip_frame >= AVDISCARD_NONREF &&
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 7d1109cb89..1fd5e506cd 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -286,7 +286,7 @@ const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
                    length + FF_INPUT_BUFFER_PADDING_SIZE);
     dst = h->rbsp_buffer[bufidx];
 
-    if (dst == NULL)
+    if (!dst)
         return NULL;
 
     memcpy(dst, src, i);
@@ -1379,7 +1379,7 @@ static int get_last_needed_nal(H264Context *h, const uint8_t *buf, int buf_size)
         ptr = ff_h264_decode_nal(h, buf + buf_index, &dst_length, &consumed,
                                  next_avc - buf_index);
 
-        if (ptr == NULL || dst_length < 0)
+        if (!ptr || dst_length < 0)
             return AVERROR_INVALIDDATA;
 
         buf_index += consumed;
@@ -1460,7 +1460,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
 
             ptr = ff_h264_decode_nal(hx, buf + buf_index, &dst_length,
                                      &consumed, next_avc - buf_index);
-            if (ptr == NULL || dst_length < 0) {
+            if (!ptr || dst_length < 0) {
                 ret = -1;
                 goto end;
             }
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index 8ced0b811d..145dce3b0c 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -215,7 +215,7 @@ static inline int parse_nal_units(AVCodecParserContext *s,
             break;
         }
         ptr = ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
-        if (ptr == NULL || dst_length < 0)
+        if (!ptr || dst_length < 0)
             break;
 
         init_get_bits(&h->gb, ptr, 8 * dst_length);
diff --git a/libavcodec/h264_ps.c b/libavcodec/h264_ps.c
index 183cc44ea3..b439fa8e4a 100644
--- a/libavcodec/h264_ps.c
+++ b/libavcodec/h264_ps.c
@@ -553,7 +553,7 @@ int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
         return AVERROR(ENOMEM);
     pps->sps_id = get_ue_golomb_31(&h->gb);
     if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
-        h->sps_buffers[pps->sps_id] == NULL) {
+        !h->sps_buffers[pps->sps_id]) {
         av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
         goto fail;
     }
diff --git a/libavcodec/h264_refs.c b/libavcodec/h264_refs.c
index ffe1fcc0b0..af7fa7b523 100644
--- a/libavcodec/h264_refs.c
+++ b/libavcodec/h264_refs.c
@@ -759,7 +759,7 @@ int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
                             (h->max_pic_num - 1);
 #if 0
                     if (mmco[i].short_pic_num >= h->short_ref_count ||
-                        h->short_ref[ mmco[i].short_pic_num ] == NULL){
+                        !h->short_ref[ mmco[i].short_pic_num ]) {
                         av_log(s->avctx, AV_LOG_ERROR,
                                "illegal short ref in memory management control "
                                "operation %d\n", mmco);
diff --git a/libavcodec/huffyuvdec.c b/libavcodec/huffyuvdec.c
index d8f31d3dd7..1ad81f7dd7 100644
--- a/libavcodec/huffyuvdec.c
+++ b/libavcodec/huffyuvdec.c
@@ -472,7 +472,7 @@ static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
     int h, cy, i;
     int offset[AV_NUM_DATA_POINTERS];
 
-    if (s->avctx->draw_horiz_band == NULL)
+    if (!s->avctx->draw_horiz_band)
         return;
 
     h  = y - s->last_slice_end;
diff --git a/libavcodec/interplayvideo.c b/libavcodec/interplayvideo.c
index 7d785e3764..af7aa130d1 100644
--- a/libavcodec/interplayvideo.c
+++ b/libavcodec/interplayvideo.c
@@ -79,7 +79,7 @@ static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x,
             motion_offset, s->upper_motion_limit_offset);
         return AVERROR_INVALIDDATA;
     }
-    if (src->data[0] == NULL) {
+    if (!src->data[0]) {
         av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");
         return AVERROR(EINVAL);
     }
diff --git a/libavcodec/lcldec.c b/libavcodec/lcldec.c
index 8923341f03..9c606976e7 100644
--- a/libavcodec/lcldec.c
+++ b/libavcodec/lcldec.c
@@ -571,7 +571,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     /* Allocate decompression buffer */
     if (c->decomp_size) {
-        if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
+        if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
             return AVERROR(ENOMEM);
         }
diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c
index dee1909609..b7a323a8a0 100644
--- a/libavcodec/libmp3lame.c
+++ b/libavcodec/libmp3lame.c
@@ -94,7 +94,7 @@ static av_cold int mp3lame_encode_init(AVCodecContext *avctx)
     s->avctx = avctx;
 
     /* initialize LAME and get defaults */
-    if ((s->gfp = lame_init()) == NULL)
+    if (!(s->gfp = lame_init()))
         return AVERROR(ENOMEM);
 
     lame_set_num_channels(s->gfp, avctx->channels);
diff --git a/libavcodec/libxvid.c b/libavcodec/libxvid.c
index ddeceacf36..f4935b836f 100644
--- a/libavcodec/libxvid.c
+++ b/libavcodec/libxvid.c
@@ -98,7 +98,7 @@ static int xvid_ff_2pass_create(xvid_plg_create_t * param,
     char *log = x->context->twopassbuffer;
 
     /* Do a quick bounds check */
-    if( log == NULL )
+    if (!log)
         return XVID_ERR_FAIL;
 
     /* We use snprintf() */
@@ -189,7 +189,7 @@ static int xvid_ff_2pass_after(struct xvid_context *ref,
     char frame_type;
 
     /* Quick bounds check */
-    if( log == NULL )
+    if (!log)
         return XVID_ERR_FAIL;
 
     /* Convert the type given to us into a character */
@@ -273,7 +273,7 @@ static int xvid_strip_vol_header(AVCodecContext *avctx,
 
     if( vo_len > 0 ) {
         /* We need to store the header, so extract it */
-        if( avctx->extradata == NULL ) {
+        if (!avctx->extradata) {
             avctx->extradata = av_malloc(vo_len);
             memcpy(avctx->extradata, pkt->data, vo_len);
             avctx->extradata_size = vo_len;
@@ -470,7 +470,7 @@ static av_cold int xvid_encode_init(AVCodecContext *avctx)  {
         rc2pass1.context = x;
         x->twopassbuffer = av_malloc(BUFFER_SIZE);
         x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
-        if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
+        if (!x->twopassbuffer || !x->old_twopassbuffer) {
             av_log(avctx, AV_LOG_ERROR,
                 "Xvid: Cannot allocate 2-pass log buffers\n");
             return -1;
@@ -491,7 +491,7 @@ static av_cold int xvid_encode_init(AVCodecContext *avctx)  {
             return -1;
         }
 
-        if( avctx->stats_in == NULL ) {
+        if (!avctx->stats_in) {
             av_log(avctx, AV_LOG_ERROR,
                 "Xvid: No 2-pass information loaded for second pass\n");
             return -1;
diff --git a/libavcodec/libxvid_rc.c b/libavcodec/libxvid_rc.c
index 7f4a89d25d..a17a776fe1 100644
--- a/libavcodec/libxvid_rc.c
+++ b/libavcodec/libxvid_rc.c
@@ -50,7 +50,7 @@ int ff_tempfile(const char *prefix, char **filename) {
     *filename = av_malloc(len);
 #endif
     /* -----common section-----*/
-    if (*filename == NULL) {
+    if (!(*filename)) {
         av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
         return -1;
     }
diff --git a/libavcodec/motion_est.c b/libavcodec/motion_est.c
index 26cde77d3c..21d2c04544 100644
--- a/libavcodec/motion_est.c
+++ b/libavcodec/motion_est.c
@@ -1731,7 +1731,7 @@ void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_
         int xy= y*s->mb_stride;
         for(x=0; x<s->mb_width; x++){
             if (s->mb_type[xy] & type){    // RAL: "type" test added...
-                if(field_select_table==NULL || field_select_table[xy] == field_select){
+                if (!field_select_table || field_select_table[xy] == field_select) {
                     if(   mv_table[xy][0] >=h_range || mv_table[xy][0] <-h_range
                        || mv_table[xy][1] >=v_range || mv_table[xy][1] <-v_range){
 
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 5a875c2518..2b86ea87fe 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2488,7 +2488,7 @@ static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
                     return -1;
                 }
 
-                if (s2->last_picture_ptr == NULL) {
+                if (!s2->last_picture_ptr) {
                     /* Skip B-frames if we do not have reference frames and
                      * GOP is not closed. */
                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
@@ -2500,7 +2500,7 @@ static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
                 }
                 if (s2->pict_type == AV_PICTURE_TYPE_I)
                     s->sync = 1;
-                if (s2->next_picture_ptr == NULL) {
+                if (!s2->next_picture_ptr) {
                     /* Skip P-frames if we do not have a reference frame or
                      * we have an invalid header. */
                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
diff --git a/libavcodec/mpegaudiodec_template.c b/libavcodec/mpegaudiodec_template.c
index 9ce03efcc8..e9c7850277 100644
--- a/libavcodec/mpegaudiodec_template.c
+++ b/libavcodec/mpegaudiodec_template.c
@@ -1803,7 +1803,7 @@ static av_cold int decode_init_mp3on4(AVCodecContext * avctx)
     MPEG4AudioConfig cfg;
     int i;
 
-    if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
+    if ((avctx->extradata_size < 2) || !avctx->extradata) {
         av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
         return AVERROR_INVALIDDATA;
     }
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index b0136c7431..c60389bd87 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -826,7 +826,7 @@ fail:
 
 static void free_duplicate_context(MpegEncContext *s)
 {
-    if (s == NULL)
+    if (!s)
         return;
 
     av_freep(&s->edge_emu_buffer);
@@ -1630,7 +1630,7 @@ static void release_unused_pictures(MpegEncContext *s)
 
 static inline int pic_is_unused(MpegEncContext *s, Picture *pic)
 {
-    if (pic->f->buf[0] == NULL)
+    if (!pic->f->buf[0])
         return 1;
     if (pic->needs_realloc && !(pic->reference & DELAYED_PIC_REF))
         return 1;
@@ -1643,7 +1643,7 @@ static int find_unused_picture(MpegEncContext *s, int shared)
 
     if (shared) {
         for (i = 0; i < MAX_PICTURE_COUNT; i++) {
-            if (s->picture[i].f->buf[0] == NULL)
+            if (!s->picture[i].f->buf[0])
                 return i;
         }
     } else {
@@ -1704,8 +1704,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
 
     release_unused_pictures(s);
 
-    if (s->current_picture_ptr &&
-        s->current_picture_ptr->f->buf[0] == NULL) {
+    if (s->current_picture_ptr && !s->current_picture_ptr->f->buf[0]) {
         // we already have a unused image
         // (maybe it was set before reading the header)
         pic = s->current_picture_ptr;
@@ -1763,8 +1762,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
             s->current_picture_ptr ? s->current_picture_ptr->f->data[0] : NULL,
             s->pict_type, s->droppable);
 
-    if ((s->last_picture_ptr == NULL ||
-         s->last_picture_ptr->f->buf[0] == NULL) &&
+    if ((!s->last_picture_ptr || !s->last_picture_ptr->f->buf[0]) &&
         (s->pict_type != AV_PICTURE_TYPE_I ||
          s->picture_structure != PICT_FRAME)) {
         int h_chroma_shift, v_chroma_shift;
@@ -1805,8 +1803,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
         ff_thread_report_progress(&s->last_picture_ptr->tf, INT_MAX, 0);
         ff_thread_report_progress(&s->last_picture_ptr->tf, INT_MAX, 1);
     }
-    if ((s->next_picture_ptr == NULL ||
-         s->next_picture_ptr->f->buf[0] == NULL) &&
+    if ((!s->next_picture_ptr || !s->next_picture_ptr->f->buf[0]) &&
         s->pict_type == AV_PICTURE_TYPE_B) {
         /* Allocate a dummy frame */
         i = ff_find_unused_picture(s, 0);
@@ -2433,7 +2430,7 @@ void ff_mpeg_flush(AVCodecContext *avctx){
     int i;
     MpegEncContext *s = avctx->priv_data;
 
-    if(s==NULL || s->picture==NULL)
+    if (!s || !s->picture)
         return;
 
     for (i = 0; i < MAX_PICTURE_COUNT; i++)
diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index fd84deb584..380eff67da 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -1221,9 +1221,9 @@ static int select_input_picture(MpegEncContext *s)
     s->reordered_input_picture[MAX_PICTURE_COUNT - 1] = NULL;
 
     /* set next picture type & ordering */
-    if (s->reordered_input_picture[0] == NULL && s->input_picture[0]) {
+    if (!s->reordered_input_picture[0] && s->input_picture[0]) {
         if (/*s->picture_in_gop_number >= s->gop_size ||*/
-            s->next_picture_ptr == NULL || s->intra_only) {
+            !s->next_picture_ptr || s->intra_only) {
             s->reordered_input_picture[0] = s->input_picture[0];
             s->reordered_input_picture[0]->f->pict_type = AV_PICTURE_TYPE_I;
             s->reordered_input_picture[0]->f->coded_picture_number =
@@ -1276,7 +1276,7 @@ static int select_input_picture(MpegEncContext *s)
                     }
                 }
                 for (i = 0; i < s->max_b_frames + 1; i++) {
-                    if (s->input_picture[i] == NULL ||
+                    if (!s->input_picture[i] ||
                         s->input_picture[i]->b_frame_score - 1 >
                             s->mb_num / s->avctx->b_sensitivity)
                         break;
diff --git a/libavcodec/options.c b/libavcodec/options.c
index e3ded738bb..f428976086 100644
--- a/libavcodec/options.c
+++ b/libavcodec/options.c
@@ -125,7 +125,8 @@ AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
 {
     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
 
-    if(avctx==NULL) return NULL;
+    if (!avctx)
+        return NULL;
 
     if(avcodec_get_context_defaults3(avctx, codec) < 0){
         av_free(avctx);
diff --git a/libavcodec/opus_celt.c b/libavcodec/opus_celt.c
index e77ca6f69a..af3e549251 100644
--- a/libavcodec/opus_celt.c
+++ b/libavcodec/opus_celt.c
@@ -1608,7 +1608,7 @@ static unsigned int celt_decode_band(CeltContext *s, OpusRangeCoder *rc,
                 for (j = 0; j < N; j++)
                     X[j] = 0.0f;
             } else {
-                if (lowband == NULL) {
+                if (!lowband) {
                     /* Noise */
                     for (j = 0; j < N; j++)
                         X[j] = (((int32_t)celt_rng(s)) >> 20);
diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
index 04e7def067..3041182e25 100644
--- a/libavcodec/qdm2.c
+++ b/libavcodec/qdm2.c
@@ -1464,7 +1464,7 @@ static void qdm2_decode_fft_packets(QDM2Context *q)
     int i, j, min, max, value, type, unknown_flag;
     GetBitContext gb;
 
-    if (q->sub_packet_list_B[0].packet == NULL)
+    if (!q->sub_packet_list_B[0].packet)
         return;
 
     /* reset minimum indexes for FFT coefficients */
diff --git a/libavcodec/roqvideo.c b/libavcodec/roqvideo.c
index 77df0798db..b0fd6ba7f3 100644
--- a/libavcodec/roqvideo.c
+++ b/libavcodec/roqvideo.c
@@ -115,7 +115,7 @@ static inline void apply_motion_generic(RoqContext *ri, int x, int y, int deltax
         return;
     }
 
-    if (ri->last_frame->data[0] == NULL) {
+    if (!ri->last_frame->data[0]) {
         av_log(ri->avctx, AV_LOG_ERROR, "Invalid decode type. Invalid header?\n");
         return;
     }
diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index 1787a7e78e..2b571c9ba2 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -326,7 +326,7 @@ static int rv20_decode_picture_header(RVDecContext *rv)
         return AVERROR_INVALIDDATA;
     }
 
-    if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B) {
+    if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {
         av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
         return AVERROR_INVALIDDATA;
     }
@@ -557,7 +557,7 @@ static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
         return AVERROR_INVALIDDATA;
     }
 
-    if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr == NULL) {
+    if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
         // FIXME write parser so we always have complete frames?
         if (s->current_picture_ptr) {
             ff_er_frame_end(&s->er);
diff --git a/libavcodec/tiffenc.c b/libavcodec/tiffenc.c
index f450edb10f..93c151e167 100644
--- a/libavcodec/tiffenc.c
+++ b/libavcodec/tiffenc.c
@@ -323,7 +323,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                      s->subsampling[0] * s->subsampling[1] + 7) >> 3;
     if (is_yuv) {
         yuv_line = av_malloc(bytes_per_row);
-        if (yuv_line == NULL) {
+        if (!yuv_line) {
             av_log(s->avctx, AV_LOG_ERROR, "Not enough memory\n");
             ret = AVERROR(ENOMEM);
             goto fail;
diff --git a/libavcodec/tscc.c b/libavcodec/tscc.c
index 16d0770bf6..86199342a9 100644
--- a/libavcodec/tscc.c
+++ b/libavcodec/tscc.c
@@ -142,7 +142,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     /* Allocate decompression buffer */
     if (c->decomp_size) {
-        if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
+        if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
             return AVERROR(ENOMEM);
         }
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 4253e8cf6c..7e116ed9e2 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -954,7 +954,7 @@ AVFrame *avcodec_alloc_frame(void)
 {
     AVFrame *frame = av_mallocz(sizeof(AVFrame));
 
-    if (frame == NULL)
+    if (!frame)
         return NULL;
 
 FF_DISABLE_DEPRECATION_WARNINGS
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 85ee9de941..2c7db0be1c 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5964,7 +5964,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 
     /* skip B-frames if we don't have reference frames */
-    if (s->last_picture_ptr == NULL && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {
+    if (!s->last_picture_ptr && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {
         goto end;
     }
     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index c215fbb4f4..c2ea8222e8 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -1416,7 +1416,7 @@ static void vp3_draw_horiz_band(Vp3DecodeContext *s, int y)
                                   0);
     }
 
-    if (s->avctx->draw_horiz_band == NULL)
+    if (!s->avctx->draw_horiz_band)
         return;
 
     h = y - s->last_slice_end;
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index e3c2bd930f..5426555793 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -2205,7 +2205,7 @@ static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
         int pos              = (mb_y << 16) | (mb_x & 0xFFFF);                \
         int sliced_threading = (avctx->active_thread_type == FF_THREAD_SLICE) && \
                                (num_jobs > 1);                                \
-        int is_null          = (next_td == NULL) || (prev_td == NULL);        \
+        int is_null          = !next_td || !prev_td;                          \
         int pos_check        = (is_null) ? 1                                  \
                                          : (next_td != td &&                  \
                                             pos >= next_td->wait_mb_pos) ||   \
diff --git a/libavcodec/zmbv.c b/libavcodec/zmbv.c
index d17f37a59f..f49cbdb014 100644
--- a/libavcodec/zmbv.c
+++ b/libavcodec/zmbv.c
@@ -493,7 +493,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac
         c->by   = (c->height + c->bh - 1) / c->bh;
     }
 
-    if (c->decode_intra == NULL) {
+    if (!c->decode_intra) {
         av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
         return AVERROR_INVALIDDATA;
     }
@@ -621,7 +621,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     /* Allocate decompression buffer */
     if (c->decomp_size) {
-        if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
+        if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
             av_log(avctx, AV_LOG_ERROR,
                    "Can't allocate decompression buffer.\n");
             return AVERROR(ENOMEM);
diff --git a/libavcodec/zmbvenc.c b/libavcodec/zmbvenc.c
index 785ee0a409..d7b518db26 100644
--- a/libavcodec/zmbvenc.c
+++ b/libavcodec/zmbvenc.c
@@ -298,7 +298,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
     memset(&c->zstream, 0, sizeof(z_stream));
     c->comp_size = avctx->width * avctx->height + 1024 +
         ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
-    if ((c->work_buf = av_malloc(c->comp_size)) == NULL) {
+    if (!(c->work_buf = av_malloc(c->comp_size))) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
         return AVERROR(ENOMEM);
     }
@@ -307,12 +307,12 @@ static av_cold int encode_init(AVCodecContext *avctx)
                            ((c->comp_size + 63) >> 6) + 11;
 
     /* Allocate compression buffer */
-    if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) {
+    if (!(c->comp_buf = av_malloc(c->comp_size))) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
         return AVERROR(ENOMEM);
     }
     c->pstride = FFALIGN(avctx->width, 16);
-    if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) {
+    if (!(c->prev = av_malloc(c->pstride * avctx->height))) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
         return AVERROR(ENOMEM);
     }
diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index adb289d140..e210dc4b29 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -361,13 +361,13 @@ static int mmap_init(AVFormatContext *ctx)
     }
     s->buffers = req.count;
     s->buf_start = av_malloc(sizeof(void *) * s->buffers);
-    if (s->buf_start == NULL) {
+    if (!s->buf_start) {
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
 
         return AVERROR(ENOMEM);
     }
     s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
-    if (s->buf_len == NULL) {
+    if (!s->buf_len) {
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
         av_free(s->buf_start);
 
@@ -513,7 +513,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
 #endif
 
         buf_descriptor = av_malloc(sizeof(struct buff_data));
-        if (buf_descriptor == NULL) {
+        if (!buf_descriptor) {
             /* Something went wrong... Since av_malloc() failed, we cannot even
              * allocate a buffer for memcpying into it
              */
diff --git a/libavformat/avs.c b/libavformat/avs.c
index 3e95a3656a..d8042c51f9 100644
--- a/libavformat/avs.c
+++ b/libavformat/avs.c
@@ -182,7 +182,7 @@ static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
             case AVS_VIDEO:
                 if (!avs->st_video) {
                     avs->st_video = avformat_new_stream(s, NULL);
-                    if (avs->st_video == NULL)
+                    if (!avs->st_video)
                         return AVERROR(ENOMEM);
                     avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO;
                     avs->st_video->codec->codec_id = AV_CODEC_ID_AVS;
@@ -198,7 +198,7 @@ static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
             case AVS_AUDIO:
                 if (!avs->st_audio) {
                     avs->st_audio = avformat_new_stream(s, NULL);
-                    if (avs->st_audio == NULL)
+                    if (!avs->st_audio)
                         return AVERROR(ENOMEM);
                     avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;
                 }
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index f15b0b3e9f..b168bdf9a6 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1519,7 +1519,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
                    track->type);
             continue;
         }
-        if (track->codec_id == NULL)
+        if (!track->codec_id)
             continue;
 
         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
@@ -1578,7 +1578,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
         }
 
         st = track->stream = avformat_new_stream(s, NULL);
-        if (st == NULL)
+        if (!st)
             return AVERROR(ENOMEM);
 
         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
@@ -1638,7 +1638,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             int profile = matroska_aac_profile(track->codec_id);
             int sri     = matroska_aac_sri(track->audio.samplerate);
             extradata   = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
-            if (extradata == NULL)
+            if (!extradata)
                 return AVERROR(ENOMEM);
             extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
             extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
@@ -1657,7 +1657,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             extradata_size = 12 + track->codec_priv.size;
             extradata      = av_mallocz(extradata_size +
                                         FF_INPUT_BUFFER_PADDING_SIZE);
-            if (extradata == NULL)
+            if (!extradata)
                 return AVERROR(ENOMEM);
             AV_WB32(extradata, extradata_size);
             memcpy(&extradata[4], "alac", 4);
@@ -1667,7 +1667,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
         } else if (codec_id == AV_CODEC_ID_TTA) {
             extradata_size = 30;
             extradata      = av_mallocz(extradata_size);
-            if (extradata == NULL)
+            if (!extradata)
                 return AVERROR(ENOMEM);
             ffio_init_context(&b, extradata, extradata_size, 1,
                               NULL, NULL, NULL, NULL);
@@ -1760,7 +1760,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             } else if (track->codec_priv.data && track->codec_priv.size > 0) {
                 st->codec->extradata = av_mallocz(track->codec_priv.size +
                                                   FF_INPUT_BUFFER_PADDING_SIZE);
-                if (st->codec->extradata == NULL)
+                if (!st->codec->extradata)
                     return AVERROR(ENOMEM);
                 st->codec->extradata_size = track->codec_priv.size;
                 memcpy(st->codec->extradata,
@@ -1872,14 +1872,14 @@ static int matroska_read_header(AVFormatContext *s)
             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
         } else {
             AVStream *st = avformat_new_stream(s, NULL);
-            if (st == NULL)
+            if (!st)
                 break;
             av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
             av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
             st->codec->codec_id   = AV_CODEC_ID_NONE;
             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
             st->codec->extradata  = av_malloc(attachments[j].bin.size);
-            if (st->codec->extradata == NULL)
+            if (!st->codec->extradata)
                 break;
             st->codec->extradata_size = attachments[j].bin.size;
             memcpy(st->codec->extradata, attachments[j].bin.data,
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index b55ad35090..cc4e71a4fb 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -285,7 +285,7 @@ static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
                                         int numelements)
 {
     mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
-    if (new_seekhead == NULL)
+    if (!new_seekhead)
         return NULL;
 
     new_seekhead->segment_offset = segment_offset;
@@ -378,7 +378,7 @@ fail:
 static mkv_cues *mkv_start_cues(int64_t segment_offset)
 {
     mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
-    if (cues == NULL)
+    if (!cues)
         return NULL;
 
     cues->segment_offset = segment_offset;
@@ -1109,7 +1109,7 @@ static int mkv_write_header(AVFormatContext *s)
         mkv_write_seekhead(pb, mkv->main_seekhead);
 
     mkv->cues = mkv_start_cues(mkv->segment_offset);
-    if (mkv->cues == NULL)
+    if (!mkv->cues)
         return AVERROR(ENOMEM);
 
     if (pb->seekable && mkv->reserve_cues_space) {
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 4d487e979e..72dcf0a725 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1713,7 +1713,7 @@ static int mov_write_track_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
     int ret, size;
     uint8_t *buf;
 
-    if (st == NULL || mov->fc->flags & AVFMT_FLAG_BITEXACT)
+    if (!st || mov->fc->flags & AVFMT_FLAG_BITEXACT)
         return 0;
 
     ret = avio_open_dyn_buf(&pb_buf);
@@ -3182,7 +3182,7 @@ static int mov_create_chapter_track(AVFormatContext *s, int tracknum)
         return AVERROR(ENOMEM);
     track->enc->codec_type = AVMEDIA_TYPE_SUBTITLE;
     track->enc->extradata = av_malloc(sizeof(chapter_properties));
-    if (track->enc->extradata == NULL)
+    if (!track->enc->extradata)
         return AVERROR(ENOMEM);
     track->enc->extradata_size = sizeof(chapter_properties);
     memcpy(track->enc->extradata, chapter_properties, sizeof(chapter_properties));
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index fb58e1fc70..dced5370e4 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -1715,7 +1715,7 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
         return 0;
     is_start = packet[1] & 0x40;
     tss = ts->pids[pid];
-    if (ts->auto_guess && tss == NULL && is_start) {
+    if (ts->auto_guess && !tss && is_start) {
         add_pes_stream(ts, pid, -1);
         tss = ts->pids[pid];
     }
diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index 3089ffdd00..670b8678c8 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -663,7 +663,7 @@ static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
     av_dlog(s, "%s()\n", __FUNCTION__);
 
     /* in case we don't already have something to eat ... */
-    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
+    if (!nsv->ahead[0].data && !nsv->ahead[1].data)
         err = nsv_read_chunk(s, 0);
     if (err < 0)
         return err;
diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c
index 0027abd421..7bc73735c2 100644
--- a/libavformat/rtpenc.c
+++ b/libavformat/rtpenc.c
@@ -142,7 +142,7 @@ static int rtp_write_header(AVFormatContext *s1)
         return AVERROR(EIO);
     }
     s->buf = av_malloc(s1->packet_size);
-    if (s->buf == NULL) {
+    if (!s->buf) {
         return AVERROR(ENOMEM);
     }
     s->max_payload_size = s1->packet_size - 12;
diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c
index 583070a745..a14ec579d9 100644
--- a/libavformat/rtspdec.c
+++ b/libavformat/rtspdec.c
@@ -408,7 +408,7 @@ static inline int parse_command_line(AVFormatContext *s, const char *line,
     }
 
     searchlinept = strchr(linept, ' ');
-    if (searchlinept == NULL) {
+    if (!searchlinept) {
         av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
         return AVERROR_INVALIDDATA;
     }
diff --git a/libavformat/rtspenc.c b/libavformat/rtspenc.c
index 8a334ec49b..3db53aca07 100644
--- a/libavformat/rtspenc.c
+++ b/libavformat/rtspenc.c
@@ -55,7 +55,7 @@ int ff_rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
 
     /* Announce the stream */
     sdp = av_mallocz(SDP_MAX_SIZE);
-    if (sdp == NULL)
+    if (!sdp)
         return AVERROR(ENOMEM);
     /* We create the SDP based on the RTSP AVFormatContext where we
      * aren't allowed to change the filename field. (We create the SDP
diff --git a/libavformat/sdp.c b/libavformat/sdp.c
index 895b9d6f4c..a690219006 100644
--- a/libavformat/sdp.c
+++ b/libavformat/sdp.c
@@ -189,7 +189,7 @@ static char *extradata2psets(AVCodecContext *c)
     }
 
     psets = av_mallocz(MAX_PSET_SIZE);
-    if (psets == NULL) {
+    if (!psets) {
         av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
         av_free(orig_extradata);
         return NULL;
@@ -216,7 +216,7 @@ static char *extradata2psets(AVCodecContext *c)
             sps = r;
             sps_end = r1;
         }
-        if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
+        if (!av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r)) {
             av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
             av_free(psets);
 
@@ -250,7 +250,7 @@ static char *extradata2config(AVCodecContext *c)
         return NULL;
     }
     config = av_malloc(10 + c->extradata_size * 2);
-    if (config == NULL) {
+    if (!config) {
         av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
         return NULL;
     }
@@ -457,7 +457,7 @@ static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c,
                     av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
                     return NULL;
                 }
-                if (config == NULL) {
+                if (!config) {
                     return NULL;
                 }
                 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
diff --git a/libavutil/eval.c b/libavutil/eval.c
index 72f976ca4b..31e9ebbc9c 100644
--- a/libavutil/eval.c
+++ b/libavutil/eval.c
@@ -231,7 +231,7 @@ static int parse_primary(AVExpr **e, Parser *p)
     }
 
     p->s= strchr(p->s, '(');
-    if (p->s==NULL) {
+    if (!p->s) {
         av_log(p, AV_LOG_ERROR, "Undefined constant or missing '(' in '%s'\n", s0);
         p->s= next;
         av_expr_free(d);
diff --git a/libavutil/internal.h b/libavutil/internal.h
index 067c6ca303..aed9925e7c 100644
--- a/libavutil/internal.h
+++ b/libavutil/internal.h
@@ -117,7 +117,7 @@
 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
 {\
     p = av_malloc(size);\
-    if (p == NULL && (size) != 0) {\
+    if (!(p) && (size) != 0) {\
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\
     }\
@@ -126,7 +126,7 @@
 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
 {\
     p = av_mallocz(size);\
-    if (p == NULL && (size) != 0) {\
+    if (!(p) && (size) != 0) {\
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\
     }\