2007-05-05 18:18:51 +00:00
|
|
|
/*
|
|
|
|
* MPEG1 / MPEG2 video parser
|
2009-01-19 15:46:40 +00:00
|
|
|
* Copyright (c) 2000,2001 Fabrice Bellard
|
2007-05-05 18:18:51 +00:00
|
|
|
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
|
|
|
|
*
|
|
|
|
* This file is part of FFmpeg.
|
|
|
|
*
|
|
|
|
* FFmpeg 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,
|
|
|
|
* 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
|
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "parser.h"
|
2013-03-26 17:25:01 +00:00
|
|
|
#include "mpeg12.h"
|
2013-03-25 12:11:41 +00:00
|
|
|
#include "internal.h"
|
2007-05-05 18:18:51 +00:00
|
|
|
|
2012-02-08 22:46:50 +00:00
|
|
|
struct MpvParseContext {
|
|
|
|
ParseContext pc;
|
|
|
|
AVRational frame_rate;
|
|
|
|
int progressive_sequence;
|
|
|
|
int width, height;
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2007-05-05 18:18:51 +00:00
|
|
|
static void mpegvideo_extract_headers(AVCodecParserContext *s,
|
|
|
|
AVCodecContext *avctx,
|
|
|
|
const uint8_t *buf, int buf_size)
|
|
|
|
{
|
2012-02-08 22:46:50 +00:00
|
|
|
struct MpvParseContext *pc = s->priv_data;
|
2009-12-14 11:57:33 +00:00
|
|
|
const uint8_t *buf_end = buf + buf_size;
|
2007-05-05 18:18:51 +00:00
|
|
|
uint32_t start_code;
|
|
|
|
int frame_rate_index, ext_type, bytes_left;
|
|
|
|
int frame_rate_ext_n, frame_rate_ext_d;
|
2011-06-01 16:26:27 +00:00
|
|
|
int top_field_first, repeat_first_field, progressive_frame;
|
2007-05-05 18:18:51 +00:00
|
|
|
int horiz_size_ext, vert_size_ext, bit_rate_ext;
|
2009-12-05 03:53:12 +00:00
|
|
|
int did_set_size=0;
|
2012-10-30 01:05:56 +00:00
|
|
|
int bit_rate = 0;
|
2012-11-02 15:25:03 +00:00
|
|
|
int vbv_delay = 0;
|
2007-05-05 18:18:51 +00:00
|
|
|
//FIXME replace the crap with get_bits()
|
|
|
|
s->repeat_pict = 0;
|
2009-12-14 11:57:33 +00:00
|
|
|
|
2007-05-05 18:18:51 +00:00
|
|
|
while (buf < buf_end) {
|
|
|
|
start_code= -1;
|
2013-03-25 12:11:41 +00:00
|
|
|
buf= avpriv_find_start_code(buf, buf_end, &start_code);
|
2007-05-05 18:18:51 +00:00
|
|
|
bytes_left = buf_end - buf;
|
|
|
|
switch(start_code) {
|
|
|
|
case PICTURE_START_CODE:
|
|
|
|
if (bytes_left >= 2) {
|
|
|
|
s->pict_type = (buf[1] >> 3) & 7;
|
2012-12-05 18:26:12 +00:00
|
|
|
if (bytes_left >= 4)
|
2012-11-02 15:25:03 +00:00
|
|
|
vbv_delay = ((buf[1] & 0x07) << 13) | (buf[2] << 5) | (buf[3] >> 3);
|
2007-05-05 18:18:51 +00:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SEQ_START_CODE:
|
|
|
|
if (bytes_left >= 7) {
|
|
|
|
pc->width = (buf[0] << 4) | (buf[1] >> 4);
|
|
|
|
pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
|
2009-12-05 03:53:12 +00:00
|
|
|
if(!avctx->width || !avctx->height || !avctx->coded_width || !avctx->coded_height){
|
2013-10-27 09:02:26 +00:00
|
|
|
ff_set_dimensions(avctx, pc->width, pc->height);
|
2009-12-05 03:53:12 +00:00
|
|
|
did_set_size=1;
|
|
|
|
}
|
2007-05-05 18:18:51 +00:00
|
|
|
frame_rate_index = buf[3] & 0xf;
|
2014-04-04 10:47:44 +00:00
|
|
|
pc->frame_rate = avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_index];
|
2012-10-30 01:05:56 +00:00
|
|
|
bit_rate = (buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6);
|
2012-08-05 09:11:04 +00:00
|
|
|
avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
|
2014-10-15 13:54:02 +00:00
|
|
|
avctx->ticks_per_frame = 1;
|
2007-05-05 18:18:51 +00:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
case EXT_START_CODE:
|
|
|
|
if (bytes_left >= 1) {
|
|
|
|
ext_type = (buf[0] >> 4);
|
|
|
|
switch(ext_type) {
|
|
|
|
case 0x1: /* sequence extension */
|
|
|
|
if (bytes_left >= 6) {
|
|
|
|
horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
|
|
|
|
vert_size_ext = (buf[2] >> 5) & 3;
|
|
|
|
bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
|
|
|
|
frame_rate_ext_n = (buf[5] >> 5) & 3;
|
|
|
|
frame_rate_ext_d = (buf[5] & 0x1f);
|
|
|
|
pc->progressive_sequence = buf[1] & (1 << 3);
|
|
|
|
avctx->has_b_frames= !(buf[5] >> 7);
|
|
|
|
|
|
|
|
pc->width |=(horiz_size_ext << 12);
|
|
|
|
pc->height |=( vert_size_ext << 12);
|
2012-10-30 01:05:56 +00:00
|
|
|
bit_rate = (bit_rate&0x3FFFF) | (bit_rate_ext << 18);
|
2009-12-05 03:53:12 +00:00
|
|
|
if(did_set_size)
|
2013-10-27 09:02:26 +00:00
|
|
|
ff_set_dimensions(avctx, pc->width, pc->height);
|
2014-10-15 13:54:02 +00:00
|
|
|
avctx->framerate.num = pc->frame_rate.num * (frame_rate_ext_n + 1);
|
2014-04-04 10:47:44 +00:00
|
|
|
avctx->framerate.den = pc->frame_rate.den * (frame_rate_ext_d + 1);
|
2012-08-05 09:11:04 +00:00
|
|
|
avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
|
2014-10-15 13:54:02 +00:00
|
|
|
avctx->ticks_per_frame = 2;
|
2007-05-05 18:18:51 +00:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
case 0x8: /* picture coding extension */
|
|
|
|
if (bytes_left >= 5) {
|
|
|
|
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 */
|
2009-02-24 20:23:19 +00:00
|
|
|
s->repeat_pict = 1;
|
2007-05-05 18:18:51 +00:00
|
|
|
if (repeat_first_field) {
|
|
|
|
if (pc->progressive_sequence) {
|
|
|
|
if (top_field_first)
|
2009-02-24 20:23:19 +00:00
|
|
|
s->repeat_pict = 5;
|
2007-05-05 18:18:51 +00:00
|
|
|
else
|
2009-02-24 20:23:19 +00:00
|
|
|
s->repeat_pict = 3;
|
2007-05-05 18:18:51 +00:00
|
|
|
} else if (progressive_frame) {
|
2009-02-24 20:23:19 +00:00
|
|
|
s->repeat_pict = 2;
|
2007-05-05 18:18:51 +00:00
|
|
|
}
|
|
|
|
}
|
2013-04-09 07:43:08 +00:00
|
|
|
|
|
|
|
if (!pc->progressive_sequence) {
|
|
|
|
if (top_field_first)
|
|
|
|
s->field_order = AV_FIELD_TT;
|
|
|
|
else
|
|
|
|
s->field_order = AV_FIELD_BB;
|
|
|
|
} else
|
|
|
|
s->field_order = AV_FIELD_PROGRESSIVE;
|
2007-05-05 18:18:51 +00:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case -1:
|
|
|
|
goto the_end;
|
|
|
|
default:
|
|
|
|
/* we stop parsing when we encounter a slice. It ensures
|
|
|
|
that this function takes a negligible amount of time */
|
|
|
|
if (start_code >= SLICE_MIN_START_CODE &&
|
|
|
|
start_code <= SLICE_MAX_START_CODE)
|
|
|
|
goto the_end;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
the_end: ;
|
2012-11-02 15:25:03 +00:00
|
|
|
if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && bit_rate) {
|
|
|
|
avctx->rc_max_rate = 400*bit_rate;
|
2014-08-20 18:01:40 +00:00
|
|
|
}
|
|
|
|
if (bit_rate &&
|
|
|
|
((avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && bit_rate != 0x3FFFF) || vbv_delay != 0xFFFF)) {
|
2012-11-02 15:25:03 +00:00
|
|
|
avctx->bit_rate = 400*bit_rate;
|
2012-10-30 01:05:56 +00:00
|
|
|
}
|
2014-04-04 10:47:44 +00:00
|
|
|
#if FF_API_AVCTX_TIMEBASE
|
|
|
|
if (avctx->framerate.num)
|
2014-10-15 13:54:02 +00:00
|
|
|
avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
|
2014-04-04 10:47:44 +00:00
|
|
|
#endif
|
2007-05-05 18:18:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int mpegvideo_parse(AVCodecParserContext *s,
|
|
|
|
AVCodecContext *avctx,
|
2007-05-07 00:47:03 +00:00
|
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
2007-05-05 18:18:51 +00:00
|
|
|
const uint8_t *buf, int buf_size)
|
|
|
|
{
|
2012-02-08 22:46:50 +00:00
|
|
|
struct MpvParseContext *pc1 = s->priv_data;
|
2007-05-05 18:18:51 +00:00
|
|
|
ParseContext *pc= &pc1->pc;
|
|
|
|
int next;
|
|
|
|
|
|
|
|
if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
|
|
|
|
next= buf_size;
|
|
|
|
}else{
|
2009-03-02 14:53:18 +00:00
|
|
|
next= ff_mpeg1_find_frame_end(pc, buf, buf_size, s);
|
2007-05-05 18:18:51 +00:00
|
|
|
|
2007-05-07 00:47:03 +00:00
|
|
|
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
|
2007-05-05 18:18:51 +00:00
|
|
|
*poutbuf = NULL;
|
|
|
|
*poutbuf_size = 0;
|
|
|
|
return buf_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
/* we have a full frame : we just parse the first few MPEG headers
|
|
|
|
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);
|
2011-04-29 15:27:01 +00:00
|
|
|
av_dlog(NULL, "pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
|
2014-10-15 13:54:02 +00:00
|
|
|
s->pict_type, av_q2d(avctx->framerate), s->repeat_pict);
|
2007-05-05 18:18:51 +00:00
|
|
|
|
2007-05-07 00:47:03 +00:00
|
|
|
*poutbuf = buf;
|
2007-05-05 18:18:51 +00:00
|
|
|
*poutbuf_size = buf_size;
|
|
|
|
return next;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpegvideo_split(AVCodecContext *avctx,
|
|
|
|
const uint8_t *buf, int buf_size)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
uint32_t state= -1;
|
2011-10-18 12:08:06 +00:00
|
|
|
int found=0;
|
2007-05-05 18:18:51 +00:00
|
|
|
|
|
|
|
for(i=0; i<buf_size; i++){
|
|
|
|
state= (state<<8) | buf[i];
|
2011-10-18 12:08:06 +00:00
|
|
|
if(state == 0x1B3){
|
|
|
|
found=1;
|
|
|
|
}else if(found && state != 0x1B5 && state < 0x200 && state >= 0x100)
|
2007-05-05 18:18:51 +00:00
|
|
|
return i-3;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-03-16 20:17:00 +00:00
|
|
|
static int mpegvideo_parse_init(AVCodecParserContext *s)
|
|
|
|
{
|
|
|
|
s->pict_type = AV_PICTURE_TYPE_NONE; // first frame might be partial
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-25 21:40:11 +00:00
|
|
|
AVCodecParser ff_mpegvideo_parser = {
|
2012-08-05 09:11:04 +00:00
|
|
|
.codec_ids = { AV_CODEC_ID_MPEG1VIDEO, AV_CODEC_ID_MPEG2VIDEO },
|
2012-02-08 22:46:50 +00:00
|
|
|
.priv_data_size = sizeof(struct MpvParseContext),
|
2012-03-16 20:17:00 +00:00
|
|
|
.parser_init = mpegvideo_parse_init,
|
2011-11-02 08:34:41 +00:00
|
|
|
.parser_parse = mpegvideo_parse,
|
2012-02-08 22:46:50 +00:00
|
|
|
.parser_close = ff_parse_close,
|
2011-11-02 08:34:41 +00:00
|
|
|
.split = mpegvideo_split,
|
2007-05-05 18:18:51 +00:00
|
|
|
};
|