X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmpeg4video_parser.c;h=a8def0e33afa3bc5df1e9d635f6bb95b7970a990;hb=ffb0af7f17eb0da86e9b140e86a1404d3c6c9e79;hp=54c04d2d16945c65b3f680aa5d4a7c3bea6f7cb0;hpb=406792e7b0f15627411728829c7a2de86fcbe96b;p=ffmpeg

diff --git a/libavcodec/mpeg4video_parser.c b/libavcodec/mpeg4video_parser.c
index 54c04d2d169..a8def0e33af 100644
--- a/libavcodec/mpeg4video_parser.c
+++ b/libavcodec/mpeg4video_parser.c
@@ -3,62 +3,70 @@
  * Copyright (c) 2003 Fabrice Bellard
  * Copyright (c) 2003 Michael Niedermayer
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "internal.h"
 #include "parser.h"
 #include "mpegvideo.h"
+#include "mpeg4video.h"
 #include "mpeg4video_parser.h"
 
+struct Mp4vParseContext {
+    ParseContext pc;
+    struct MpegEncContext enc;
+    int first_picture;
+};
 
-int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
+int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
+{
     int vop_found, i;
     uint32_t state;
 
-    vop_found= pc->frame_start_found;
-    state= pc->state;
+    vop_found = pc->frame_start_found;
+    state     = pc->state;
 
-    i=0;
-    if(!vop_found){
-        for(i=0; i<buf_size; i++){
-            state= (state<<8) | buf[i];
-            if(state == 0x1B6){
+    i = 0;
+    if (!vop_found) {
+        for (i = 0; i < buf_size; i++) {
+            state = (state << 8) | buf[i];
+            if (state == 0x1B6) {
                 i++;
-                vop_found=1;
+                vop_found = 1;
                 break;
             }
         }
     }
 
-    if(vop_found){
+    if (vop_found) {
         /* EOF considered as end of frame */
         if (buf_size == 0)
             return 0;
-        for(; i<buf_size; i++){
-            state= (state<<8) | buf[i];
-            if((state&0xFFFFFF00) == 0x100){
-                pc->frame_start_found=0;
-                pc->state=-1;
-                return i-3;
+        for (; i < buf_size; i++) {
+            state = (state << 8) | buf[i];
+            if ((state & 0xFFFFFF00) == 0x100) {
+                pc->frame_start_found = 0;
+                pc->state             = -1;
+                return i - 3;
             }
         }
     }
-    pc->frame_start_found= vop_found;
-    pc->state= state;
+    pc->frame_start_found = vop_found;
+    pc->state             = state;
     return END_NOT_FOUND;
 }
 
@@ -67,72 +75,72 @@ static int av_mpeg4_decode_header(AVCodecParserContext *s1,
                                   AVCodecContext *avctx,
                                   const uint8_t *buf, int buf_size)
 {
-    ParseContext1 *pc = s1->priv_data;
-    MpegEncContext *s = pc->enc;
+    struct Mp4vParseContext *pc = s1->priv_data;
+    MpegEncContext *s = &pc->enc;
     GetBitContext gb1, *gb = &gb1;
     int ret;
 
-    s->avctx = avctx;
+    s->avctx               = avctx;
     s->current_picture_ptr = &s->current_picture;
 
-    if (avctx->extradata_size && pc->first_picture){
-        init_get_bits(gb, avctx->extradata, avctx->extradata_size*8);
+    if (avctx->extradata_size && pc->first_picture) {
+        init_get_bits(gb, avctx->extradata, avctx->extradata_size * 8);
         ret = ff_mpeg4_decode_picture_header(s, gb);
     }
 
     init_get_bits(gb, buf, 8 * buf_size);
     ret = ff_mpeg4_decode_picture_header(s, gb);
-    if (s->width) {
-        avcodec_set_dimensions(avctx, s->width, s->height);
+    if (s->width && (!avctx->width || !avctx->height ||
+                     !avctx->coded_width || !avctx->coded_height)) {
+        ret = ff_set_dimensions(avctx, s->width, s->height);
+        if (ret < 0)
+            return ret;
     }
-    s1->pict_type= s->pict_type;
+    s1->pict_type     = s->pict_type;
     pc->first_picture = 0;
     return ret;
 }
 
-static int mpeg4video_parse_init(AVCodecParserContext *s)
+static av_cold int mpeg4video_parse_init(AVCodecParserContext *s)
 {
-    ParseContext1 *pc = s->priv_data;
+    struct Mp4vParseContext *pc = s->priv_data;
 
-    pc->enc = av_mallocz(sizeof(MpegEncContext));
-    if (!pc->enc)
-        return -1;
-    pc->first_picture = 1;
+    pc->first_picture           = 1;
+    pc->enc.slice_context_count = 1;
     return 0;
 }
 
 static int mpeg4video_parse(AVCodecParserContext *s,
-                           AVCodecContext *avctx,
-                           const uint8_t **poutbuf, int *poutbuf_size,
-                           const uint8_t *buf, int buf_size)
+                            AVCodecContext *avctx,
+                            const uint8_t **poutbuf, int *poutbuf_size,
+                            const uint8_t *buf, int buf_size)
 {
     ParseContext *pc = s->priv_data;
     int next;
 
-    if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
-        next= buf_size;
-    }else{
-        next= ff_mpeg4_find_frame_end(pc, buf, buf_size);
+    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+        next = buf_size;
+    } else {
+        next = ff_mpeg4_find_frame_end(pc, buf, buf_size);
 
         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
-            *poutbuf = NULL;
+            *poutbuf      = NULL;
             *poutbuf_size = 0;
             return buf_size;
         }
     }
     av_mpeg4_decode_header(s, avctx, buf, buf_size);
 
-    *poutbuf = buf;
+    *poutbuf      = buf;
     *poutbuf_size = buf_size;
     return next;
 }
 
-
-AVCodecParser mpeg4video_parser = {
-    { CODEC_ID_MPEG4 },
-    sizeof(ParseContext1),
-    mpeg4video_parse_init,
-    mpeg4video_parse,
-    ff_parse1_close,
-    ff_mpeg4video_split,
+AVCodecParser ff_mpeg4video_parser = {
+    .codec_ids      = { AV_CODEC_ID_MPEG4 },
+    .priv_data_size = sizeof(struct Mp4vParseContext),
+    .parser_init    = mpeg4video_parse_init,
+    .parser_parse   = mpeg4video_parse,
+    .parser_close   = ff_parse_close,
+    .split          = ff_mpeg4video_split,
 };