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/*
* Audio and Video frame extraction |
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* Copyright (c) 2003 Fabrice Bellard
* Copyright (c) 2003 Michael Niedermayer |
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* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include "parser.h" |
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|
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static AVCodecParser *av_first_parser = NULL; |
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|
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AVCodecParser* av_parser_next(AVCodecParser *p){
if(p) return p->next;
else return av_first_parser;
}
|
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void av_register_codec_parser(AVCodecParser *parser)
{
parser->next = av_first_parser;
av_first_parser = parser;
}
AVCodecParserContext *av_parser_init(int codec_id)
{
AVCodecParserContext *s;
AVCodecParser *parser;
int ret; |
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|
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if(codec_id == CODEC_ID_NONE)
return NULL; |
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for(parser = av_first_parser; parser != NULL; parser = parser->next) {
if (parser->codec_ids[0] == codec_id ||
parser->codec_ids[1] == codec_id || |
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parser->codec_ids[2] == codec_id ||
parser->codec_ids[3] == codec_id ||
parser->codec_ids[4] == codec_id) |
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goto found;
}
return NULL;
found:
s = av_mallocz(sizeof(AVCodecParserContext));
if (!s)
return NULL;
s->parser = parser; |
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s->priv_data = av_mallocz(parser->priv_data_size);
if (!s->priv_data) {
av_free(s);
return NULL; |
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}
if (parser->parser_init) {
ret = parser->parser_init(s);
if (ret != 0) {
av_free(s->priv_data);
av_free(s);
return NULL;
}
} |
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s->fetch_timestamp=1; |
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s->pict_type = AV_PICTURE_TYPE_I; |
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s->key_frame = -1; |
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s->convergence_duration = 0; |
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s->dts_sync_point = INT_MIN;
s->dts_ref_dts_delta = INT_MIN;
s->pts_dts_delta = INT_MIN; |
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return s;
}
|
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void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){ |
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int i; |
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|
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s->dts= s->pts= AV_NOPTS_VALUE; |
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s->pos= -1; |
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s->offset= 0;
for(i = 0; i < AV_PARSER_PTS_NB; i++) { |
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if ( s->cur_offset + off >= s->cur_frame_offset[i] |
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&& (s->frame_offset < s->cur_frame_offset[i] ||
(!s->frame_offset && !s->next_frame_offset)) // first field/frame |
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//check is disabled because mpeg-ts doesnt send complete PES packets |
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&& /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){ |
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s->dts= s->cur_frame_dts[i];
s->pts= s->cur_frame_pts[i]; |
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s->pos= s->cur_frame_pos[i]; |
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s->offset = s->next_frame_offset - s->cur_frame_offset[i]; |
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if(remove)
s->cur_frame_offset[i]= INT64_MAX; |
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if(s->cur_offset + off < s->cur_frame_end[i])
break; |
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}
}
}
|
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int av_parser_parse2(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size,
int64_t pts, int64_t dts,
int64_t pos)
{ |
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int index, i; |
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uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE]; |
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|
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if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
s->next_frame_offset =
s->cur_offset = pos;
s->flags |= PARSER_FLAG_FETCHED_OFFSET;
}
|
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if (buf_size == 0) {
/* padding is always necessary even if EOF, so we add it here */
memset(dummy_buf, 0, sizeof(dummy_buf));
buf = dummy_buf; |
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} else if (s->cur_offset + buf_size !=
s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */ |
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/* add a new packet descriptor */ |
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i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
s->cur_frame_start_index = i;
s->cur_frame_offset[i] = s->cur_offset;
s->cur_frame_end[i] = s->cur_offset + buf_size;
s->cur_frame_pts[i] = pts;
s->cur_frame_dts[i] = dts; |
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s->cur_frame_pos[i] = pos; |
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} |
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|
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if (s->fetch_timestamp){
s->fetch_timestamp=0; |
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s->last_pts = s->pts;
s->last_dts = s->dts; |
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s->last_pos = s->pos; |
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ff_fetch_timestamp(s, 0, 0); |
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}
|
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/* WARNING: the returned index can be negative */ |
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index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size); |
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//av_log(NULL, AV_LOG_DEBUG, "parser: in:%"PRId64", %"PRId64", out:%"PRId64", %"PRId64", in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id); |
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/* update the file pointer */
if (*poutbuf_size) { |
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/* fill the data for the current frame */ |
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s->frame_offset = s->next_frame_offset; |
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|
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/* offset of the next frame */ |
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s->next_frame_offset = s->cur_offset + index; |
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s->fetch_timestamp=1; |
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}
if (index < 0)
index = 0;
s->cur_offset += index;
return index;
}
|
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/**
*
* @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed |
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* @deprecated use AVBitstreamFilter |
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*/ |
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int av_parser_change(AVCodecParserContext *s,
AVCodecContext *avctx, |
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uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size, int keyframe){ |
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|
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if(s && s->parser->split){ |
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if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){ |
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int i= s->parser->split(avctx, buf, buf_size);
buf += i;
buf_size -= i;
}
}
|
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/* cast to avoid warning about discarding qualifiers */
*poutbuf= (uint8_t *) buf; |
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*poutbuf_size= buf_size;
if(avctx->extradata){
if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) |
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/*||(s->pict_type != AV_PICTURE_TYPE_I && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/ |
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/*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
int size= buf_size + avctx->extradata_size;
*poutbuf_size= size;
*poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); |
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|
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memcpy(*poutbuf, avctx->extradata, avctx->extradata_size); |
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memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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return 1;
}
}
return 0;
}
|
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void av_parser_close(AVCodecParserContext *s)
{ |
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if(s){ |
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if (s->parser->parser_close)
s->parser->parser_close(s);
av_free(s->priv_data);
av_free(s); |
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} |
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}
/*****************************************************/
/**
* combines the (truncated) bitstream to a complete frame |
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* @return -1 if no complete frame could be created, AVERROR(ENOMEM) if there was a memory allocation error |
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*/ |
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int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size) |
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{
#if 0
if(pc->overread){
printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
}
#endif
|
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/* Copy overread bytes from last frame into buffer. */ |
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for(; pc->overread>0; pc->overread--){
pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
} |
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/* flush remaining if EOF */
if(!*buf_size && next == END_NOT_FOUND){
next= 0;
}
|
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pc->last_index= pc->index;
/* copy into buffer end return */
if(next == END_NOT_FOUND){ |
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void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); |
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|
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if(!new_buffer)
return AVERROR(ENOMEM);
pc->buffer = new_buffer; |
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memcpy(&pc->buffer[pc->index], *buf, *buf_size);
pc->index += *buf_size;
return -1;
}
*buf_size=
pc->overread_index= pc->index + next; |
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|
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/* append to buffer */
if(pc->index){ |
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void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); |
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|
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if(!new_buffer)
return AVERROR(ENOMEM);
pc->buffer = new_buffer; |
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memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
pc->index = 0;
*buf= pc->buffer;
}
/* store overread bytes */
for(;next < 0; next++){
pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next]; |
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pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next]; |
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pc->overread++;
}
if(pc->overread){ |
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av_dlog(pc, "overread %d, state:%X next:%d index:%d o_index:%d\n",
pc->overread, pc->state, next, pc->index, pc->overread_index);
av_dlog(pc, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); |
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}
return 0;
}
|
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void ff_parse_close(AVCodecParserContext *s) |
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{ |
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ParseContext *pc = s->priv_data; |
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|
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av_freep(&pc->buffer); |
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}
|
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void ff_parse1_close(AVCodecParserContext *s) |
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{ |
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ParseContext1 *pc1 = s->priv_data; |
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|
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av_free(pc1->pc.buffer);
av_free(pc1->enc); |
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}
|
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/*************************/
|
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int ff_mpeg4video_split(AVCodecContext *avctx, |
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const uint8_t *buf, int buf_size)
{
int i;
uint32_t state= -1; |
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|
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for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if(state == 0x1B3 || state == 0x1B6) |
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return i-3; |
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}
return 0;
} |