mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 2492 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
parent
962d6ae6c5
commit
8424cf505c
4 changed files with 949 additions and 2 deletions
@ -0,0 +1,892 @@ |
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/*
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* Audio and Video frame extraction |
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* Copyright (c) 2003 Fabrice Bellard. |
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* Copyright (c) 2003 Michael Niedermayer. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avcodec.h" |
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#include "mpegvideo.h" |
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#include "mpegaudio.h" |
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AVCodecParser *av_first_parser = NULL; |
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void av_register_codec_parser(AVCodecParser *parser) |
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{ |
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parser->next = av_first_parser; |
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av_first_parser = parser; |
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} |
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AVCodecParserContext *av_parser_init(int codec_id) |
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{ |
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AVCodecParserContext *s; |
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AVCodecParser *parser; |
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int ret; |
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for(parser = av_first_parser; parser != NULL; parser = parser->next) { |
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if (parser->codec_ids[0] == codec_id || |
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parser->codec_ids[1] == codec_id || |
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parser->codec_ids[2] == codec_id) |
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goto found; |
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} |
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return NULL; |
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found: |
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s = av_mallocz(sizeof(AVCodecParserContext)); |
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if (!s) |
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return NULL; |
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s->parser = parser; |
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s->priv_data = av_mallocz(parser->priv_data_size); |
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if (!s->priv_data) { |
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av_free(s); |
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return NULL; |
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} |
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if (parser->parser_init) { |
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ret = parser->parser_init(s); |
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if (ret != 0) { |
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av_free(s->priv_data); |
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av_free(s); |
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return NULL; |
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} |
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} |
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return s; |
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} |
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int av_parser_parse(AVCodecParserContext *s,
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AVCodecContext *avctx, |
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size) |
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{ |
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int index; |
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/* WARNING: the returned index can be negative */ |
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index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size); |
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/* update the file pointer */ |
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if (*poutbuf_size) { |
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s->frame_offset = s->last_frame_offset; |
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s->last_frame_offset = s->cur_offset + index; |
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} |
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if (index < 0) |
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index = 0; |
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s->cur_offset += index; |
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return index; |
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} |
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void av_parser_close(AVCodecParserContext *s) |
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{ |
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if (s->parser->parser_close) |
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s->parser->parser_close(s); |
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av_free(s->priv_data); |
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av_free(s); |
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} |
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/*****************************************************/ |
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//#define END_NOT_FOUND (-100)
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#define PICTURE_START_CODE 0x00000100 |
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#define SEQ_START_CODE 0x000001b3 |
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#define EXT_START_CODE 0x000001b5 |
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#define SLICE_MIN_START_CODE 0x00000101 |
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#define SLICE_MAX_START_CODE 0x000001af |
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typedef struct ParseContext1{ |
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uint8_t *buffer; |
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int index; |
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int last_index; |
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int buffer_size; |
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uint32_t state; ///< contains the last few bytes in MSB order
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int frame_start_found; |
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int overread; ///< the number of bytes which where irreversibly read from the next frame
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int overread_index; ///< the index into ParseContext1.buffer of the overreaded bytes
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/* MPEG2 specific */ |
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int frame_rate; |
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int progressive_sequence; |
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int width, height; |
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/* XXX: suppress that, needed by MPEG4 */ |
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MpegEncContext *enc; |
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} ParseContext1; |
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/**
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* combines the (truncated) bitstream to a complete frame |
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* @returns -1 if no complete frame could be created |
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*/ |
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static int ff_combine_frame1(ParseContext1 *pc, int next, uint8_t **buf, int *buf_size) |
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{ |
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#if 0 |
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if(pc->overread){ |
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printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); |
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printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); |
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} |
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#endif |
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/* copy overreaded bytes from last frame into buffer */ |
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for(; pc->overread>0; pc->overread--){ |
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pc->buffer[pc->index++]= pc->buffer[pc->overread_index++]; |
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} |
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pc->last_index= pc->index; |
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/* copy into buffer end return */ |
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if(next == END_NOT_FOUND){ |
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pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); |
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memcpy(&pc->buffer[pc->index], *buf, *buf_size); |
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pc->index += *buf_size; |
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return -1; |
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} |
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*buf_size= |
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pc->overread_index= pc->index + next; |
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/* append to buffer */ |
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if(pc->index){ |
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pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); |
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memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE ); |
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pc->index = 0; |
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*buf= pc->buffer; |
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} |
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/* store overread bytes */ |
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for(;next < 0; next++){ |
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pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next]; |
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pc->overread++; |
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} |
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#if 0 |
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if(pc->overread){ |
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printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); |
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printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); |
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} |
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#endif |
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return 0; |
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} |
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/**
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* finds the end of the current frame in the bitstream. |
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* @return the position of the first byte of the next frame, or -1 |
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*/ |
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static int mpeg1_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size) |
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{ |
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int i; |
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uint32_t state; |
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state= pc->state; |
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i=0; |
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if(!pc->frame_start_found){ |
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for(i=0; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){ |
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i++; |
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pc->frame_start_found=1; |
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break; |
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} |
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} |
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} |
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if(pc->frame_start_found){ |
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for(; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if((state&0xFFFFFF00) == 0x100){ |
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if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){ |
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pc->frame_start_found=0; |
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pc->state=-1;
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return i-3; |
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} |
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} |
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} |
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}
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pc->state= state; |
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return END_NOT_FOUND; |
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} |
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static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end) |
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{ |
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const uint8_t *buf_ptr; |
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unsigned int state=0xFFFFFFFF, v; |
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int val; |
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buf_ptr = *pbuf_ptr; |
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while (buf_ptr < buf_end) { |
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v = *buf_ptr++; |
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if (state == 0x000001) { |
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state = ((state << 8) | v) & 0xffffff; |
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val = state; |
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goto found; |
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} |
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state = ((state << 8) | v) & 0xffffff; |
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} |
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val = -1; |
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found: |
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*pbuf_ptr = buf_ptr; |
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return val; |
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} |
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/* XXX: merge with libavcodec ? */ |
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#define MPEG1_FRAME_RATE_BASE 1001 |
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static const int frame_rate_tab[16] = { |
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0,
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24000, |
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24024, |
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25025, |
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30000, |
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30030, |
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50050, |
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60000, |
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60060, |
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// Xing's 15fps: (9)
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15015, |
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// libmpeg3's "Unofficial economy rates": (10-13)
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5005, |
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10010, |
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12012, |
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15015, |
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// random, just to avoid segfault !never encode these
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25025, |
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25025, |
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}; |
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static void mpegvideo_extract_headers(AVCodecParserContext *s,
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AVCodecContext *avctx, |
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const uint8_t *buf, int buf_size) |
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{ |
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ParseContext1 *pc = s->priv_data; |
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const uint8_t *buf_end; |
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int32_t start_code; |
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int frame_rate_index, ext_type, bytes_left; |
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int frame_rate_ext_n, frame_rate_ext_d; |
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int top_field_first, repeat_first_field, progressive_frame; |
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int horiz_size_ext, vert_size_ext; |
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s->repeat_pict = 0; |
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buf_end = buf + buf_size; |
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while (buf < buf_end) { |
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start_code = find_start_code(&buf, buf_end); |
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bytes_left = buf_end - buf; |
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switch(start_code) { |
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case PICTURE_START_CODE: |
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if (bytes_left >= 2) { |
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s->pict_type = (buf[1] >> 3) & 7; |
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} |
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break; |
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case SEQ_START_CODE: |
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if (bytes_left >= 4) { |
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pc->width = avctx->width = (buf[0] << 4) | (buf[1] >> 4); |
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pc->height = avctx->height = ((buf[1] & 0x0f) << 8) | buf[2]; |
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frame_rate_index = buf[3] & 0xf; |
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pc->frame_rate = avctx->frame_rate = frame_rate_tab[frame_rate_index]; |
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avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE; |
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} |
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break; |
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case EXT_START_CODE: |
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if (bytes_left >= 1) { |
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ext_type = (buf[0] >> 4); |
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switch(ext_type) { |
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case 0x1: /* sequence extension */ |
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if (bytes_left >= 6) { |
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horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7); |
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vert_size_ext = (buf[2] >> 5) & 3; |
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frame_rate_ext_n = (buf[5] >> 5) & 3; |
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frame_rate_ext_d = (buf[5] & 0x1f); |
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pc->progressive_sequence = buf[1] & (1 << 3); |
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avctx->width = pc->width | (horiz_size_ext << 12); |
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avctx->height = pc->height | (vert_size_ext << 12); |
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avctx->frame_rate = pc->frame_rate * (frame_rate_ext_n + 1); |
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avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d + 1); |
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avctx->sub_id = 2; /* forces MPEG2 */ |
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} |
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break; |
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case 0x8: /* picture coding extension */ |
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if (bytes_left >= 5) { |
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top_field_first = buf[3] & (1 << 7); |
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repeat_first_field = buf[3] & (1 << 1); |
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progressive_frame = buf[4] & (1 << 7); |
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/* check if we must repeat the frame */ |
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if (repeat_first_field) { |
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if (pc->progressive_sequence) { |
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if (top_field_first) |
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s->repeat_pict = 4; |
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else |
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s->repeat_pict = 2; |
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} else if (progressive_frame) { |
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s->repeat_pict = 1; |
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} |
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} |
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} |
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break; |
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} |
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} |
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break; |
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case -1: |
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goto the_end; |
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default: |
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/* we stop parsing when we encounter a slice. It ensures
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that this function takes a negligible amount of time */ |
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if (start_code >= SLICE_MIN_START_CODE &&
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start_code <= SLICE_MAX_START_CODE) |
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goto the_end; |
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break; |
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} |
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} |
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the_end: ; |
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} |
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static int mpegvideo_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size) |
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{ |
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ParseContext1 *pc = s->priv_data; |
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int next; |
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next= mpeg1_find_frame_end(pc, buf, buf_size); |
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if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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/* we have a full frame : we just parse the first few MPEG headers
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to have the full timing information. The time take by this |
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function should be negligible for uncorrupted streams */ |
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mpegvideo_extract_headers(s, avctx, buf, buf_size); |
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#if 0 |
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printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
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s->pict_type, (double)avctx->frame_rate / avctx->frame_rate_base, s->repeat_pict); |
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#endif |
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*poutbuf = (uint8_t *)buf; |
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*poutbuf_size = buf_size; |
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return next; |
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} |
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static void mpegvideo_parse_close(AVCodecParserContext *s) |
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{ |
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ParseContext1 *pc = s->priv_data; |
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av_free(pc->buffer); |
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av_free(pc->enc); |
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} |
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/*************************/ |
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/**
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* finds the end of the current frame in the bitstream. |
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* @return the position of the first byte of the next frame, or -1 |
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*/ |
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static int mpeg4_find_frame_end(ParseContext1 *pc,
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const uint8_t *buf, int buf_size) |
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{ |
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int vop_found, i; |
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uint32_t state; |
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vop_found= pc->frame_start_found; |
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state= pc->state; |
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i=0; |
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if(!vop_found){ |
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for(i=0; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if(state == 0x1B6){ |
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i++; |
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vop_found=1; |
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break; |
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} |
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} |
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} |
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if(vop_found){
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for(; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if((state&0xFFFFFF00) == 0x100){ |
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pc->frame_start_found=0; |
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pc->state=-1;
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return i-3; |
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} |
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} |
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} |
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pc->frame_start_found= vop_found; |
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pc->state= state; |
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return END_NOT_FOUND; |
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} |
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/* used by parser */ |
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/* XXX: make it use less memory */ |
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static int av_mpeg4_decode_header(AVCodecParserContext *s1,
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AVCodecContext *avctx, |
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const uint8_t *buf, int buf_size) |
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{ |
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ParseContext1 *pc = s1->priv_data; |
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MpegEncContext *s = pc->enc; |
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GetBitContext gb1, *gb = &gb1; |
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int ret; |
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s->avctx = avctx; |
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init_get_bits(gb, buf, 8 * buf_size); |
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ret = ff_mpeg4_decode_picture_header(s, gb); |
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if (s->width) { |
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avctx->width = s->width; |
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avctx->height = s->height; |
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} |
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return ret; |
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} |
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int mpeg4video_parse_init(AVCodecParserContext *s) |
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{ |
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ParseContext1 *pc = s->priv_data; |
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pc->enc = av_mallocz(sizeof(MpegEncContext)); |
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if (!pc->enc) |
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return -1; |
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return 0; |
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} |
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static int mpeg4video_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size) |
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{ |
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ParseContext1 *pc = s->priv_data; |
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int next; |
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next= mpeg4_find_frame_end(pc, buf, buf_size); |
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if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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av_mpeg4_decode_header(s, avctx, buf, buf_size); |
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*poutbuf = (uint8_t *)buf; |
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*poutbuf_size = buf_size; |
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return next; |
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} |
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/*************************/ |
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static int h263_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size) |
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{ |
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int vop_found, i; |
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uint32_t state; |
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vop_found= pc->frame_start_found; |
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state= pc->state; |
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i=0; |
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if(!vop_found){ |
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for(i=0; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if(state>>(32-22) == 0x20){ |
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i++; |
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vop_found=1; |
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break; |
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} |
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} |
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} |
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if(vop_found){
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for(; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if(state>>(32-22) == 0x20){ |
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pc->frame_start_found=0; |
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pc->state=-1;
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return i-3; |
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} |
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} |
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} |
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pc->frame_start_found= vop_found; |
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pc->state= state; |
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return END_NOT_FOUND; |
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} |
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static int h263_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size) |
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{ |
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ParseContext1 *pc = s->priv_data; |
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int next; |
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next= h263_find_frame_end(pc, buf, buf_size); |
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if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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|
||||
*poutbuf = (uint8_t *)buf; |
||||
*poutbuf_size = buf_size; |
||||
return next; |
||||
} |
||||
|
||||
/*************************/ |
||||
|
||||
/**
|
||||
* finds the end of the current frame in the bitstream. |
||||
* @return the position of the first byte of the next frame, or -1 |
||||
*/ |
||||
static int h264_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size) |
||||
{ |
||||
int i; |
||||
uint32_t state; |
||||
//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
|
||||
// mb_addr= pc->mb_addr - 1;
|
||||
state= pc->state; |
||||
//FIXME this will fail with slices
|
||||
for(i=0; i<buf_size; i++){ |
||||
state= (state<<8) | buf[i]; |
||||
if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){ |
||||
if(pc->frame_start_found){ |
||||
pc->state=-1;
|
||||
pc->frame_start_found= 0; |
||||
return i-3; |
||||
} |
||||
pc->frame_start_found= 1; |
||||
} |
||||
} |
||||
|
||||
pc->state= state; |
||||
return END_NOT_FOUND; |
||||
} |
||||
|
||||
static int h264_parse(AVCodecParserContext *s, |
||||
AVCodecContext *avctx, |
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size) |
||||
{ |
||||
ParseContext1 *pc = s->priv_data; |
||||
int next; |
||||
|
||||
next= h264_find_frame_end(pc, buf, buf_size); |
||||
|
||||
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) { |
||||
*poutbuf = NULL; |
||||
*poutbuf_size = 0; |
||||
return buf_size; |
||||
} |
||||
|
||||
*poutbuf = (uint8_t *)buf; |
||||
*poutbuf_size = buf_size; |
||||
return next; |
||||
} |
||||
|
||||
/*************************/ |
||||
|
||||
typedef struct MpegAudioParseContext { |
||||
uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */ |
||||
uint8_t *inbuf_ptr; |
||||
int frame_size; |
||||
int free_format_frame_size; |
||||
int free_format_next_header; |
||||
} MpegAudioParseContext; |
||||
|
||||
#define MPA_HEADER_SIZE 4 |
||||
|
||||
/* header + layer + bitrate + freq + lsf/mpeg25 */ |
||||
#define SAME_HEADER_MASK \ |
||||
(0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19)) |
||||
|
||||
static int mpegaudio_parse_init(AVCodecParserContext *s1) |
||||
{ |
||||
MpegAudioParseContext *s = s1->priv_data; |
||||
s->inbuf_ptr = s->inbuf; |
||||
return 0; |
||||
} |
||||
|
||||
static int mpegaudio_parse(AVCodecParserContext *s1, |
||||
AVCodecContext *avctx, |
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size) |
||||
{ |
||||
MpegAudioParseContext *s = s1->priv_data; |
||||
int len, ret; |
||||
uint32_t header; |
||||
const uint8_t *buf_ptr; |
||||
|
||||
*poutbuf = NULL; |
||||
*poutbuf_size = 0; |
||||
buf_ptr = buf; |
||||
while (buf_size > 0) { |
||||
len = s->inbuf_ptr - s->inbuf; |
||||
if (s->frame_size == 0) { |
||||
/* special case for next header for first frame in free
|
||||
format case (XXX: find a simpler method) */ |
||||
if (s->free_format_next_header != 0) { |
||||
s->inbuf[0] = s->free_format_next_header >> 24; |
||||
s->inbuf[1] = s->free_format_next_header >> 16; |
||||
s->inbuf[2] = s->free_format_next_header >> 8; |
||||
s->inbuf[3] = s->free_format_next_header; |
||||
s->inbuf_ptr = s->inbuf + 4; |
||||
s->free_format_next_header = 0; |
||||
goto got_header; |
||||
} |
||||
/* no header seen : find one. We need at least MPA_HEADER_SIZE
|
||||
bytes to parse it */ |
||||
len = MPA_HEADER_SIZE - len; |
||||
if (len > buf_size) |
||||
len = buf_size; |
||||
if (len > 0) { |
||||
memcpy(s->inbuf_ptr, buf_ptr, len); |
||||
buf_ptr += len; |
||||
buf_size -= len; |
||||
s->inbuf_ptr += len; |
||||
} |
||||
if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) { |
||||
got_header: |
||||
header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) | |
||||
(s->inbuf[2] << 8) | s->inbuf[3]; |
||||
|
||||
ret = mpa_decode_header(avctx, header); |
||||
if (ret < 0) { |
||||
/* no sync found : move by one byte (inefficient, but simple!) */ |
||||
memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1); |
||||
s->inbuf_ptr--; |
||||
dprintf("skip %x\n", header); |
||||
/* reset free format frame size to give a chance
|
||||
to get a new bitrate */ |
||||
s->free_format_frame_size = 0; |
||||
} else { |
||||
s->frame_size = ret; |
||||
#if 0 |
||||
/* free format: prepare to compute frame size */ |
||||
if (decode_header(s, header) == 1) { |
||||
s->frame_size = -1; |
||||
} |
||||
#endif |
||||
} |
||||
} |
||||
} else
|
||||
#if 0 |
||||
if (s->frame_size == -1) { |
||||
/* free format : find next sync to compute frame size */ |
||||
len = MPA_MAX_CODED_FRAME_SIZE - len; |
||||
if (len > buf_size) |
||||
len = buf_size; |
||||
if (len == 0) { |
||||
/* frame too long: resync */ |
||||
s->frame_size = 0; |
||||
memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1); |
||||
s->inbuf_ptr--; |
||||
} else { |
||||
uint8_t *p, *pend; |
||||
uint32_t header1; |
||||
int padding; |
||||
|
||||
memcpy(s->inbuf_ptr, buf_ptr, len); |
||||
/* check for header */ |
||||
p = s->inbuf_ptr - 3; |
||||
pend = s->inbuf_ptr + len - 4; |
||||
while (p <= pend) { |
||||
header = (p[0] << 24) | (p[1] << 16) | |
||||
(p[2] << 8) | p[3]; |
||||
header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) | |
||||
(s->inbuf[2] << 8) | s->inbuf[3]; |
||||
/* check with high probability that we have a
|
||||
valid header */ |
||||
if ((header & SAME_HEADER_MASK) == |
||||
(header1 & SAME_HEADER_MASK)) { |
||||
/* header found: update pointers */ |
||||
len = (p + 4) - s->inbuf_ptr; |
||||
buf_ptr += len; |
||||
buf_size -= len; |
||||
s->inbuf_ptr = p; |
||||
/* compute frame size */ |
||||
s->free_format_next_header = header; |
||||
s->free_format_frame_size = s->inbuf_ptr - s->inbuf; |
||||
padding = (header1 >> 9) & 1; |
||||
if (s->layer == 1) |
||||
s->free_format_frame_size -= padding * 4; |
||||
else |
||||
s->free_format_frame_size -= padding; |
||||
dprintf("free frame size=%d padding=%d\n",
|
||||
s->free_format_frame_size, padding); |
||||
decode_header(s, header1); |
||||
goto next_data; |
||||
} |
||||
p++; |
||||
} |
||||
/* not found: simply increase pointers */ |
||||
buf_ptr += len; |
||||
s->inbuf_ptr += len; |
||||
buf_size -= len; |
||||
} |
||||
} else
|
||||
#endif |
||||
if (len < s->frame_size) { |
||||
if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE) |
||||
s->frame_size = MPA_MAX_CODED_FRAME_SIZE; |
||||
len = s->frame_size - len; |
||||
if (len > buf_size) |
||||
len = buf_size; |
||||
memcpy(s->inbuf_ptr, buf_ptr, len); |
||||
buf_ptr += len; |
||||
s->inbuf_ptr += len; |
||||
buf_size -= len; |
||||
} |
||||
// next_data:
|
||||
if (s->frame_size > 0 &&
|
||||
(s->inbuf_ptr - s->inbuf) >= s->frame_size) { |
||||
*poutbuf = s->inbuf; |
||||
*poutbuf_size = s->inbuf_ptr - s->inbuf; |
||||
s->inbuf_ptr = s->inbuf; |
||||
s->frame_size = 0; |
||||
break; |
||||
} |
||||
} |
||||
return buf_ptr - buf; |
||||
} |
||||
|
||||
#ifdef CONFIG_AC3 |
||||
extern int a52_syncinfo (const uint8_t * buf, int * flags, |
||||
int * sample_rate, int * bit_rate); |
||||
|
||||
typedef struct AC3ParseContext { |
||||
uint8_t inbuf[4096]; /* input buffer */ |
||||
uint8_t *inbuf_ptr; |
||||
int frame_size; |
||||
int flags; |
||||
} AC3ParseContext; |
||||
|
||||
#define AC3_HEADER_SIZE 7 |
||||
#define A52_LFE 16 |
||||
|
||||
static int ac3_parse_init(AVCodecParserContext *s1) |
||||
{ |
||||
AC3ParseContext *s = s1->priv_data; |
||||
s->inbuf_ptr = s->inbuf; |
||||
return 0; |
||||
} |
||||
|
||||
static int ac3_parse(AVCodecParserContext *s1, |
||||
AVCodecContext *avctx, |
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size) |
||||
{ |
||||
AC3ParseContext *s = s1->priv_data; |
||||
const uint8_t *buf_ptr; |
||||
int len, sample_rate, bit_rate; |
||||
static const int ac3_channels[8] = { |
||||
2, 1, 2, 3, 3, 4, 4, 5 |
||||
}; |
||||
|
||||
*poutbuf = NULL; |
||||
*poutbuf_size = 0; |
||||
|
||||
buf_ptr = buf; |
||||
while (buf_size > 0) { |
||||
len = s->inbuf_ptr - s->inbuf; |
||||
if (s->frame_size == 0) { |
||||
/* no header seen : find one. We need at least 7 bytes to parse it */ |
||||
len = AC3_HEADER_SIZE - len; |
||||
if (len > buf_size) |
||||
len = buf_size; |
||||
memcpy(s->inbuf_ptr, buf_ptr, len); |
||||
buf_ptr += len; |
||||
s->inbuf_ptr += len; |
||||
buf_size -= len; |
||||
if ((s->inbuf_ptr - s->inbuf) == AC3_HEADER_SIZE) { |
||||
len = a52_syncinfo(s->inbuf, &s->flags, &sample_rate, &bit_rate); |
||||
if (len == 0) { |
||||
/* no sync found : move by one byte (inefficient, but simple!) */ |
||||
memmove(s->inbuf, s->inbuf + 1, AC3_HEADER_SIZE - 1); |
||||
s->inbuf_ptr--; |
||||
} else { |
||||
s->frame_size = len; |
||||
/* update codec info */ |
||||
avctx->sample_rate = sample_rate; |
||||
avctx->channels = ac3_channels[s->flags & 7]; |
||||
if (s->flags & A52_LFE) |
||||
avctx->channels++; |
||||
avctx->bit_rate = bit_rate; |
||||
avctx->frame_size = 6 * 256; |
||||
} |
||||
} |
||||
} else if (len < s->frame_size) { |
||||
len = s->frame_size - len; |
||||
if (len > buf_size) |
||||
len = buf_size; |
||||
|
||||
memcpy(s->inbuf_ptr, buf_ptr, len); |
||||
buf_ptr += len; |
||||
s->inbuf_ptr += len; |
||||
buf_size -= len; |
||||
} else { |
||||
*poutbuf = s->inbuf; |
||||
*poutbuf_size = s->frame_size; |
||||
s->inbuf_ptr = s->inbuf; |
||||
s->frame_size = 0; |
||||
break; |
||||
} |
||||
} |
||||
return buf_ptr - buf; |
||||
} |
||||
#endif |
||||
|
||||
AVCodecParser mpegvideo_parser = { |
||||
{ CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO }, |
||||
sizeof(ParseContext1), |
||||
NULL, |
||||
mpegvideo_parse, |
||||
mpegvideo_parse_close, |
||||
}; |
||||
|
||||
AVCodecParser mpeg4video_parser = { |
||||
{ CODEC_ID_MPEG4 }, |
||||
sizeof(ParseContext1), |
||||
mpeg4video_parse_init, |
||||
mpeg4video_parse, |
||||
mpegvideo_parse_close, |
||||
}; |
||||
|
||||
AVCodecParser h263_parser = { |
||||
{ CODEC_ID_H263 }, |
||||
sizeof(ParseContext1), |
||||
NULL, |
||||
h263_parse, |
||||
mpegvideo_parse_close, |
||||
}; |
||||
|
||||
AVCodecParser h264_parser = { |
||||
{ CODEC_ID_H264 }, |
||||
sizeof(ParseContext1), |
||||
NULL, |
||||
h264_parse, |
||||
mpegvideo_parse_close, |
||||
}; |
||||
|
||||
AVCodecParser mpegaudio_parser = { |
||||
{ CODEC_ID_MP2, CODEC_ID_MP3 }, |
||||
sizeof(MpegAudioParseContext), |
||||
mpegaudio_parse_init, |
||||
mpegaudio_parse, |
||||
NULL, |
||||
}; |
||||
|
||||
#ifdef CONFIG_AC3 |
||||
AVCodecParser ac3_parser = { |
||||
{ CODEC_ID_AC3 }, |
||||
sizeof(AC3ParseContext), |
||||
ac3_parse_init, |
||||
ac3_parse, |
||||
NULL, |
||||
}; |
||||
#endif |
Loading…
Reference in new issue