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/* |
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* MPEG Audio parser |
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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 "parser.h" |
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#include "mpegaudiodecheader.h" |
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#include "libavutil/common.h" |
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#include "libavformat/apetag.h" // for APE tag. |
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#include "libavformat/id3v1.h" // for ID3v1_TAG_SIZE |
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typedef struct MpegAudioParseContext { |
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ParseContext pc; |
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int frame_size; |
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uint32_t header; |
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int header_count; |
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int no_bitrate; |
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} MpegAudioParseContext; |
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#define MPA_HEADER_SIZE 4 |
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/* header + layer + freq + lsf/mpeg25 */ |
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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(AVCodecParserContext *s1, |
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AVCodecContext *avctx, |
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const 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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ParseContext *pc = &s->pc; |
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uint32_t state= pc->state; |
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int i; |
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int next= END_NOT_FOUND; |
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int flush = !buf_size; |
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✓✓ |
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for(i=0; i<buf_size; ){ |
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✓✓ |
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if(s->frame_size){ |
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int inc= FFMIN(buf_size - i, s->frame_size); |
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i += inc; |
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s->frame_size -= inc; |
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state = 0; |
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✓✓ |
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if(!s->frame_size){ |
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next= i; |
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break; |
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} |
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}else{ |
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✓✓ |
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while(i<buf_size){ |
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int ret, sr, channels, bit_rate, frame_size; |
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enum AVCodecID codec_id = avctx->codec_id; |
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state= (state<<8) + buf[i++]; |
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ret = ff_mpa_decode_header(state, &sr, &channels, &frame_size, &bit_rate, &codec_id); |
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✓✓ |
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if (ret < 4) { |
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✓✓ |
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if (i > 4) |
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s->header_count = -2; |
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} else { |
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✓✗✓✓
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int header_threshold = avctx->codec_id != AV_CODEC_ID_NONE && avctx->codec_id != codec_id; |
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✓✓✓✓
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if((state&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header) |
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s->header_count= -3; |
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s->header= state; |
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s->header_count++; |
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s->frame_size = ret-4; |
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✓✓ |
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if (s->header_count > header_threshold) { |
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avctx->sample_rate= sr; |
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avctx->channels = channels; |
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s1->duration = frame_size; |
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avctx->codec_id = codec_id; |
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✓✓✓✓
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if (s->no_bitrate || !avctx->bit_rate) { |
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s->no_bitrate = 1; |
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avctx->bit_rate += (bit_rate - avctx->bit_rate) / (s->header_count - header_threshold); |
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} |
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} |
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✓✓ |
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if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
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s->frame_size = 0; |
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next = buf_size; |
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✗✓ |
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} else if (codec_id == AV_CODEC_ID_MP3ADU) { |
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avpriv_report_missing_feature(avctx, |
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"MP3ADU full parser"); |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; /* parsers must not return error codes */ |
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} |
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break; |
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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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✓✓ |
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if (ff_combine_frame(pc, next, &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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if (flush && buf_size >= ID3v1_TAG_SIZE && memcmp(buf, "TAG", 3) == 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return next; |
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} |
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✓✓✓✓ ✗✓ |
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if (flush && buf_size >= APE_TAG_FOOTER_BYTES && memcmp(buf, APE_TAG_PREAMBLE, 8) == 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return next; |
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} |
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*poutbuf = buf; |
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*poutbuf_size = buf_size; |
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return next; |
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} |
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AVCodecParser ff_mpegaudio_parser = { |
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.codec_ids = { AV_CODEC_ID_MP1, AV_CODEC_ID_MP2, AV_CODEC_ID_MP3, AV_CODEC_ID_MP3ADU }, |
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.priv_data_size = sizeof(MpegAudioParseContext), |
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.parser_parse = mpegaudio_parse, |
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.parser_close = ff_parse_close, |
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}; |