Remove useless line.
[ffmpeg.git] / libavcodec / mpegvideo_parser.c
index 5b48b1c..28ed590 100644 (file)
@@ -1,6 +1,6 @@
 /*
  * MPEG1 / MPEG2 video parser
- * Copyright (c) 2000,2001 Fabrice Bellard.
+ * Copyright (c) 2000,2001 Fabrice Bellard
  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
@@ -28,16 +28,16 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
                                       const uint8_t *buf, int buf_size)
 {
     ParseContext1 *pc = s->priv_data;
-    const uint8_t *buf_end;
+    const uint8_t *buf_end = buf + buf_size;
     uint32_t start_code;
     int frame_rate_index, ext_type, bytes_left;
     int frame_rate_ext_n, frame_rate_ext_d;
     int picture_structure, top_field_first, repeat_first_field, progressive_frame;
     int horiz_size_ext, vert_size_ext, bit_rate_ext;
+    int did_set_size=0;
 //FIXME replace the crap with get_bits()
     s->repeat_pict = 0;
-    s->parity = 0;
-    buf_end = buf + buf_size;
+
     while (buf < buf_end) {
         start_code= -1;
         buf= ff_find_start_code(buf, buf_end, &start_code);
@@ -52,7 +52,10 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
             if (bytes_left >= 7) {
                 pc->width  = (buf[0] << 4) | (buf[1] >> 4);
                 pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
-                avcodec_set_dimensions(avctx, pc->width, pc->height);
+                if(!avctx->width || !avctx->height || !avctx->coded_width || !avctx->coded_height){
+                    avcodec_set_dimensions(avctx, pc->width, pc->height);
+                    did_set_size=1;
+                }
                 frame_rate_index = buf[3] & 0xf;
                 pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
                 pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
@@ -78,8 +81,9 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
                         pc->width  |=(horiz_size_ext << 12);
                         pc->height |=( vert_size_ext << 12);
                         avctx->bit_rate += (bit_rate_ext << 18) * 400;
-                        avcodec_set_dimensions(avctx, pc->width, pc->height);
-                        avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
+                        if(did_set_size)
+                            avcodec_set_dimensions(avctx, pc->width, pc->height);
+                        avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1) * 2;
                         avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
                         avctx->codec_id = CODEC_ID_MPEG2VIDEO;
                         avctx->sub_id = 2; /* forces MPEG2 */
@@ -93,14 +97,15 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
                         progressive_frame = buf[4] & (1 << 7);
 
                         /* check if we must repeat the frame */
+                        s->repeat_pict = 1;
                         if (repeat_first_field) {
                             if (pc->progressive_sequence) {
                                 if (top_field_first)
-                                    s->repeat_pict = 4;
+                                    s->repeat_pict = 5;
                                 else
-                                    s->repeat_pict = 2;
+                                    s->repeat_pict = 3;
                             } else if (progressive_frame) {
-                                s->repeat_pict = 1;
+                                s->repeat_pict = 2;
                             }
                         }
                     }
@@ -134,7 +139,7 @@ static int mpegvideo_parse(AVCodecParserContext *s,
     if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
         next= buf_size;
     }else{
-        next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
+        next= ff_mpeg1_find_frame_end(pc, buf, buf_size, s);
 
         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
             *poutbuf = NULL;
@@ -177,5 +182,4 @@ AVCodecParser mpegvideo_parser = {
     NULL,
     mpegvideo_parse,
     ff_parse1_close,
-    mpegvideo_split,
 };