mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 20:42:49 +08:00
835 lines
26 KiB
C
835 lines
26 KiB
C
/*
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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 file is part of FFmpeg.
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*
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* 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
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* 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
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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 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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#include "avcodec.h"
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#include "mpegvideo.h"
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#include "mpegaudio.h"
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#include "ac3.h"
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#include "parser.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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if(codec_id == CODEC_ID_NONE)
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return NULL;
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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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parser->codec_ids[3] == codec_id ||
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parser->codec_ids[4] == 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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s->fetch_timestamp=1;
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s->pict_type = FF_I_TYPE;
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return s;
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}
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/**
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*
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* @param buf input
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* @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output)
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* @param pts input presentation timestamp
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* @param dts input decoding timestamp
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* @param poutbuf will contain a pointer to the first byte of the output frame
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* @param poutbuf_size will contain the length of the output frame
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* @return the number of bytes of the input bitstream used
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*
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* Example:
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* @code
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* while(in_len){
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* len = av_parser_parse(myparser, AVCodecContext, &data, &size,
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* in_data, in_len,
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* pts, dts);
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* in_data += len;
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* in_len -= len;
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*
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* if(size)
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* decode_frame(data, size);
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* }
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* @endcode
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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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int64_t pts, int64_t dts)
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{
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int index, i, k;
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uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
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if (buf_size == 0) {
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/* padding is always necessary even if EOF, so we add it here */
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memset(dummy_buf, 0, sizeof(dummy_buf));
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buf = dummy_buf;
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} else {
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/* add a new packet descriptor */
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k = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
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s->cur_frame_start_index = k;
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s->cur_frame_offset[k] = s->cur_offset;
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s->cur_frame_pts[k] = pts;
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s->cur_frame_dts[k] = dts;
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/* fill first PTS/DTS */
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if (s->fetch_timestamp){
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s->fetch_timestamp=0;
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s->last_pts = pts;
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s->last_dts = dts;
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s->cur_frame_pts[k] =
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s->cur_frame_dts[k] = AV_NOPTS_VALUE;
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}
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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, 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 */
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if (*poutbuf_size) {
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/* fill the data for the current frame */
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s->frame_offset = s->last_frame_offset;
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s->pts = s->last_pts;
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s->dts = s->last_dts;
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/* offset of the next frame */
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s->last_frame_offset = s->cur_offset + index;
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/* find the packet in which the new frame starts. It
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is tricky because of MPEG video start codes
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which can begin in one packet and finish in
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another packet. In the worst case, an MPEG
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video start code could be in 4 different
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packets. */
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k = s->cur_frame_start_index;
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for(i = 0; i < AV_PARSER_PTS_NB; i++) {
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if (s->last_frame_offset >= s->cur_frame_offset[k])
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break;
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k = (k - 1) & (AV_PARSER_PTS_NB - 1);
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}
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s->last_pts = s->cur_frame_pts[k];
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s->last_dts = s->cur_frame_dts[k];
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/* some parsers tell us the packet size even before seeing the first byte of the next packet,
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so the next pts/dts is in the next chunk */
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if(index == buf_size){
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s->fetch_timestamp=1;
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}
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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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/**
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*
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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,
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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, int keyframe){
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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);
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buf += i;
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buf_size -= i;
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}
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}
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/* cast to avoid warning about discarding qualifiers */
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*poutbuf= (uint8_t *) buf;
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*poutbuf_size= buf_size;
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if(avctx->extradata){
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if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
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/*||(s->pict_type != I_TYPE && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
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/*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
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int size= buf_size + avctx->extradata_size;
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*poutbuf_size= size;
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*poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
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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;
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}
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}
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return 0;
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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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/**
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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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int ff_combine_frame(ParseContext *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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/* flush remaining if EOF */
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if(!*buf_size && next == END_NOT_FOUND){
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next= 0;
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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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void ff_parse_close(AVCodecParserContext *s)
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{
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ParseContext *pc = s->priv_data;
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av_free(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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av_free(pc1->pc.buffer);
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av_free(pc1->enc);
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}
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/*************************/
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#ifdef CONFIG_MPEG4VIDEO_PARSER
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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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s->current_picture_ptr = &s->current_picture;
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if (avctx->extradata_size && pc->first_picture){
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init_get_bits(gb, avctx->extradata, avctx->extradata_size*8);
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ret = ff_mpeg4_decode_picture_header(s, gb);
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}
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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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avcodec_set_dimensions(avctx, s->width, s->height);
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}
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s1->pict_type= s->pict_type;
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pc->first_picture = 0;
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return ret;
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}
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static 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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pc->first_picture = 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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ParseContext *pc = s->priv_data;
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int next;
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if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
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next= buf_size;
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}else{
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next= ff_mpeg4_find_frame_end(pc, buf, buf_size);
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if (ff_combine_frame(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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}
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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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#endif
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int ff_mpeg4video_split(AVCodecContext *avctx,
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const uint8_t *buf, int buf_size)
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{
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int i;
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uint32_t state= -1;
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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 == 0x1B3 || state == 0x1B6)
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return i-3;
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}
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return 0;
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}
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/*************************/
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#ifdef CONFIG_MPEGAUDIO_PARSER
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typedef struct MpegAudioParseContext {
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uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
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uint8_t *inbuf_ptr;
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int frame_size;
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int free_format_frame_size;
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int free_format_next_header;
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uint32_t header;
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int header_count;
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} MpegAudioParseContext;
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#define MPA_HEADER_SIZE 4
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/* header + layer + bitrate + freq + lsf/mpeg25 */
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#undef SAME_HEADER_MASK /* mpegaudio.h defines different version */
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#define SAME_HEADER_MASK \
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(0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
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static int mpegaudio_parse_init(AVCodecParserContext *s1)
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{
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MpegAudioParseContext *s = s1->priv_data;
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s->inbuf_ptr = s->inbuf;
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return 0;
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}
|
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|
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static int mpegaudio_parse(AVCodecParserContext *s1,
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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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MpegAudioParseContext *s = s1->priv_data;
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int len, ret, sr;
|
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uint32_t header;
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const uint8_t *buf_ptr;
|
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|
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*poutbuf = NULL;
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*poutbuf_size = 0;
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buf_ptr = buf;
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while (buf_size > 0) {
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len = s->inbuf_ptr - s->inbuf;
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if (s->frame_size == 0) {
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/* special case for next header for first frame in free
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format case (XXX: find a simpler method) */
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if (s->free_format_next_header != 0) {
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s->inbuf[0] = s->free_format_next_header >> 24;
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s->inbuf[1] = s->free_format_next_header >> 16;
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s->inbuf[2] = s->free_format_next_header >> 8;
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s->inbuf[3] = s->free_format_next_header;
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s->inbuf_ptr = s->inbuf + 4;
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s->free_format_next_header = 0;
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goto got_header;
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}
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/* no header seen : find one. We need at least MPA_HEADER_SIZE
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bytes to parse it */
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len = FFMIN(MPA_HEADER_SIZE - len, buf_size);
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if (len > 0) {
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memcpy(s->inbuf_ptr, buf_ptr, len);
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buf_ptr += len;
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buf_size -= len;
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s->inbuf_ptr += len;
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}
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if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) {
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got_header:
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header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
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(s->inbuf[2] << 8) | s->inbuf[3];
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|
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ret = mpa_decode_header(avctx, header, &sr);
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if (ret < 0) {
|
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s->header_count= -2;
|
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/* no sync found : move by one byte (inefficient, but simple!) */
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memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
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s->inbuf_ptr--;
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dprintf(avctx, "skip %x\n", header);
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/* reset free format frame size to give a chance
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to get a new bitrate */
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s->free_format_frame_size = 0;
|
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} else {
|
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if((header&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
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s->header_count= -3;
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s->header= header;
|
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s->header_count++;
|
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s->frame_size = ret;
|
|
|
|
#if 0
|
|
/* free format: prepare to compute frame size */
|
|
if (decode_header(s, header) == 1) {
|
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s->frame_size = -1;
|
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}
|
|
#endif
|
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}
|
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if(s->header_count > 1)
|
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avctx->sample_rate= sr;
|
|
}
|
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} else
|
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#if 0
|
|
if (s->frame_size == -1) {
|
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/* 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(avctx, "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 = FFMIN(s->frame_size - len, buf_size);
|
|
memcpy(s->inbuf_ptr, buf_ptr, len);
|
|
buf_ptr += len;
|
|
s->inbuf_ptr += len;
|
|
buf_size -= len;
|
|
}
|
|
|
|
if(s->frame_size > 0 && buf_ptr - buf == s->inbuf_ptr - s->inbuf
|
|
&& buf_size + buf_ptr - buf >= s->frame_size){
|
|
if(s->header_count > 0){
|
|
*poutbuf = buf;
|
|
*poutbuf_size = s->frame_size;
|
|
}
|
|
buf_ptr = buf + s->frame_size;
|
|
s->inbuf_ptr = s->inbuf;
|
|
s->frame_size = 0;
|
|
break;
|
|
}
|
|
|
|
// next_data:
|
|
if (s->frame_size > 0 &&
|
|
(s->inbuf_ptr - s->inbuf) >= s->frame_size) {
|
|
if(s->header_count > 0){
|
|
*poutbuf = s->inbuf;
|
|
*poutbuf_size = s->inbuf_ptr - s->inbuf;
|
|
}
|
|
s->inbuf_ptr = s->inbuf;
|
|
s->frame_size = 0;
|
|
break;
|
|
}
|
|
}
|
|
return buf_ptr - buf;
|
|
}
|
|
#endif /* CONFIG_MPEGAUDIO_PARSER */
|
|
|
|
#if defined(CONFIG_AC3_PARSER) || defined(CONFIG_AAC_PARSER)
|
|
/* also used for ADTS AAC */
|
|
typedef struct AC3ParseContext {
|
|
uint8_t *inbuf_ptr;
|
|
int frame_size;
|
|
int header_size;
|
|
int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
|
|
int *bit_rate, int *samples);
|
|
uint8_t inbuf[8192]; /* input buffer */
|
|
} AC3ParseContext;
|
|
|
|
#define AC3_HEADER_SIZE 7
|
|
#define AAC_HEADER_SIZE 7
|
|
|
|
#ifdef CONFIG_AC3_PARSER
|
|
|
|
static const uint8_t eac3_blocks[4] = {
|
|
1, 2, 3, 6
|
|
};
|
|
|
|
#endif /* CONFIG_AC3_PARSER */
|
|
|
|
#ifdef CONFIG_AAC_PARSER
|
|
static const int aac_sample_rates[16] = {
|
|
96000, 88200, 64000, 48000, 44100, 32000,
|
|
24000, 22050, 16000, 12000, 11025, 8000, 7350
|
|
};
|
|
|
|
static const int aac_channels[8] = {
|
|
0, 1, 2, 3, 4, 5, 6, 8
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_AC3_PARSER
|
|
static int ac3_sync(const uint8_t *buf, int *channels, int *sample_rate,
|
|
int *bit_rate, int *samples)
|
|
{
|
|
int err;
|
|
unsigned int fscod, acmod, bsid, lfeon;
|
|
unsigned int strmtyp, substreamid, frmsiz, fscod2, numblkscod;
|
|
GetBitContext bits;
|
|
AC3HeaderInfo hdr;
|
|
|
|
err = ff_ac3_parse_header(buf, &hdr);
|
|
|
|
if(err < 0 && err != -2)
|
|
return 0;
|
|
|
|
bsid = hdr.bsid;
|
|
if(bsid <= 10) { /* Normal AC-3 */
|
|
*sample_rate = hdr.sample_rate;
|
|
*bit_rate = hdr.bit_rate;
|
|
*channels = hdr.channels;
|
|
*samples = AC3_FRAME_SIZE;
|
|
return hdr.frame_size;
|
|
} else if (bsid > 10 && bsid <= 16) { /* Enhanced AC-3 */
|
|
init_get_bits(&bits, &buf[2], (AC3_HEADER_SIZE-2) * 8);
|
|
strmtyp = get_bits(&bits, 2);
|
|
substreamid = get_bits(&bits, 3);
|
|
|
|
if (strmtyp != 0 || substreamid != 0)
|
|
return 0; /* Currently don't support additional streams */
|
|
|
|
frmsiz = get_bits(&bits, 11) + 1;
|
|
fscod = get_bits(&bits, 2);
|
|
if (fscod == 3) {
|
|
fscod2 = get_bits(&bits, 2);
|
|
numblkscod = 3;
|
|
|
|
if(fscod2 == 3)
|
|
return 0;
|
|
|
|
*sample_rate = ff_ac3_freqs[fscod2] / 2;
|
|
} else {
|
|
numblkscod = get_bits(&bits, 2);
|
|
|
|
*sample_rate = ff_ac3_freqs[fscod];
|
|
}
|
|
|
|
acmod = get_bits(&bits, 3);
|
|
lfeon = get_bits1(&bits);
|
|
|
|
*samples = eac3_blocks[numblkscod] * 256;
|
|
*bit_rate = frmsiz * (*sample_rate) * 16 / (*samples);
|
|
*channels = ff_ac3_channels[acmod] + lfeon;
|
|
|
|
return frmsiz * 2;
|
|
}
|
|
|
|
/* Unsupported bitstream version */
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_AC3_PARSER */
|
|
|
|
#ifdef CONFIG_AAC_PARSER
|
|
static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
|
|
int *bit_rate, int *samples)
|
|
{
|
|
GetBitContext bits;
|
|
int size, rdb, ch, sr;
|
|
|
|
init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
|
|
|
|
if(get_bits(&bits, 12) != 0xfff)
|
|
return 0;
|
|
|
|
skip_bits1(&bits); /* id */
|
|
skip_bits(&bits, 2); /* layer */
|
|
skip_bits1(&bits); /* protection_absent */
|
|
skip_bits(&bits, 2); /* profile_objecttype */
|
|
sr = get_bits(&bits, 4); /* sample_frequency_index */
|
|
if(!aac_sample_rates[sr])
|
|
return 0;
|
|
skip_bits1(&bits); /* private_bit */
|
|
ch = get_bits(&bits, 3); /* channel_configuration */
|
|
if(!aac_channels[ch])
|
|
return 0;
|
|
skip_bits1(&bits); /* original/copy */
|
|
skip_bits1(&bits); /* home */
|
|
|
|
/* adts_variable_header */
|
|
skip_bits1(&bits); /* copyright_identification_bit */
|
|
skip_bits1(&bits); /* copyright_identification_start */
|
|
size = get_bits(&bits, 13); /* aac_frame_length */
|
|
skip_bits(&bits, 11); /* adts_buffer_fullness */
|
|
rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
|
|
|
|
*channels = aac_channels[ch];
|
|
*sample_rate = aac_sample_rates[sr];
|
|
*samples = (rdb + 1) * 1024;
|
|
*bit_rate = size * 8 * *sample_rate / *samples;
|
|
|
|
return size;
|
|
}
|
|
#endif /* CONFIG_AAC_PARSER */
|
|
|
|
#ifdef CONFIG_AC3_PARSER
|
|
static int ac3_parse_init(AVCodecParserContext *s1)
|
|
{
|
|
AC3ParseContext *s = s1->priv_data;
|
|
s->inbuf_ptr = s->inbuf;
|
|
s->header_size = AC3_HEADER_SIZE;
|
|
s->sync = ac3_sync;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_AAC_PARSER
|
|
static int aac_parse_init(AVCodecParserContext *s1)
|
|
{
|
|
AC3ParseContext *s = s1->priv_data;
|
|
s->inbuf_ptr = s->inbuf;
|
|
s->header_size = AAC_HEADER_SIZE;
|
|
s->sync = aac_sync;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* also used for ADTS AAC */
|
|
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, channels, samples;
|
|
|
|
*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 s->header_size
|
|
bytes to parse it */
|
|
len = FFMIN(s->header_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) == s->header_size) {
|
|
len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
|
|
&samples);
|
|
if (len == 0) {
|
|
/* no sync found : move by one byte (inefficient, but simple!) */
|
|
memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
|
|
s->inbuf_ptr--;
|
|
} else {
|
|
s->frame_size = len;
|
|
/* update codec info */
|
|
avctx->sample_rate = sample_rate;
|
|
/* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
|
|
if(avctx->codec_id == CODEC_ID_AC3){
|
|
if(avctx->channels!=1 && avctx->channels!=2){
|
|
avctx->channels = channels;
|
|
}
|
|
} else {
|
|
avctx->channels = channels;
|
|
}
|
|
avctx->bit_rate = bit_rate;
|
|
avctx->frame_size = samples;
|
|
}
|
|
}
|
|
} else {
|
|
len = FFMIN(s->frame_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 == s->frame_size){
|
|
*poutbuf = s->inbuf;
|
|
*poutbuf_size = s->frame_size;
|
|
s->inbuf_ptr = s->inbuf;
|
|
s->frame_size = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return buf_ptr - buf;
|
|
}
|
|
#endif /* CONFIG_AC3_PARSER || CONFIG_AAC_PARSER */
|
|
|
|
#ifdef CONFIG_MPEG4VIDEO_PARSER
|
|
AVCodecParser mpeg4video_parser = {
|
|
{ CODEC_ID_MPEG4 },
|
|
sizeof(ParseContext1),
|
|
mpeg4video_parse_init,
|
|
mpeg4video_parse,
|
|
ff_parse1_close,
|
|
ff_mpeg4video_split,
|
|
};
|
|
#endif
|
|
#ifdef CONFIG_MPEGAUDIO_PARSER
|
|
AVCodecParser mpegaudio_parser = {
|
|
{ CODEC_ID_MP2, CODEC_ID_MP3 },
|
|
sizeof(MpegAudioParseContext),
|
|
mpegaudio_parse_init,
|
|
mpegaudio_parse,
|
|
NULL,
|
|
};
|
|
#endif
|
|
#ifdef CONFIG_AC3_PARSER
|
|
AVCodecParser ac3_parser = {
|
|
{ CODEC_ID_AC3 },
|
|
sizeof(AC3ParseContext),
|
|
ac3_parse_init,
|
|
ac3_parse,
|
|
NULL,
|
|
};
|
|
#endif
|
|
#ifdef CONFIG_AAC_PARSER
|
|
AVCodecParser aac_parser = {
|
|
{ CODEC_ID_AAC },
|
|
sizeof(AC3ParseContext),
|
|
aac_parse_init,
|
|
ac3_parse,
|
|
NULL,
|
|
};
|
|
#endif
|