/*
* 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.
+ * 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 "parser.h"
#include "mpegvideo.h"
+struct MpvParseContext {
+ ParseContext pc;
+ AVRational frame_rate;
+ int progressive_sequence;
+ int width, height;
+};
+
+
static void mpegvideo_extract_headers(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
- ParseContext1 *pc = s->priv_data;
- const uint8_t *buf_end;
+ struct MpvParseContext *pc = s->priv_data;
+ 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 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);
+ buf= avpriv_mpv_find_start_code(buf, buf_end, &start_code);
bytes_left = buf_end - buf;
switch(start_code) {
case PICTURE_START_CODE:
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;
+ pc->frame_rate.den = avctx->time_base.den = avpriv_frame_rate_tab[frame_rate_index].num;
+ pc->frame_rate.num = avctx->time_base.num = avpriv_frame_rate_tab[frame_rate_index].den;
avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
- avctx->codec_id = CODEC_ID_MPEG1VIDEO;
- avctx->sub_id = 1;
+ avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
}
break;
case EXT_START_CODE:
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 */
+ avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
}
break;
case 0x8: /* picture coding extension */
if (bytes_left >= 5) {
- picture_structure = buf[2]&3;
top_field_first = buf[3] & (1 << 7);
repeat_first_field = buf[3] & (1 << 1);
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;
}
}
-
- /* the packet only represents half a frame
- XXX,FIXME maybe find a different solution */
- if(picture_structure != 3){
- s->repeat_pict = -1;
- s->parity = picture_structure-1;
- }else
- s->parity = !top_field_first;
}
break;
}
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
- ParseContext1 *pc1 = s->priv_data;
+ struct MpvParseContext *pc1 = s->priv_data;
ParseContext *pc= &pc1->pc;
int next;
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;
to have the full timing information. The time take by this
function should be negligible for uncorrupted streams */
mpegvideo_extract_headers(s, avctx, buf, buf_size);
-#if 0
- printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
- s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
-#endif
+ av_dlog(NULL, "pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
+ s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
*poutbuf = buf;
*poutbuf_size = buf_size;
return 0;
}
-AVCodecParser mpegvideo_parser = {
- { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
- sizeof(ParseContext1),
- NULL,
- mpegvideo_parse,
- ff_parse1_close,
- mpegvideo_split,
+AVCodecParser ff_mpegvideo_parser = {
+ .codec_ids = { AV_CODEC_ID_MPEG1VIDEO, AV_CODEC_ID_MPEG2VIDEO },
+ .priv_data_size = sizeof(struct MpvParseContext),
+ .parser_parse = mpegvideo_parse,
+ .parser_close = ff_parse_close,
+ .split = mpegvideo_split,
};
projects / ffmpeg / blobdiff