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![Anton Khirnov](/assets/img/avatar_default.png)
patch by Anton Khirnov anton _at_ khirnov _dot_ net Originally committed as revision 25505 to svn://svn.ffmpeg.org/ffmpeg/trunk
370 lines
10 KiB
C
370 lines
10 KiB
C
/*
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* MP3 muxer and demuxer
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* Copyright (c) 2003 Fabrice Bellard
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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 <strings.h>
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "id3v2.h"
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#include "id3v1.h"
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#if CONFIG_MP3_DEMUXER
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#include "libavcodec/mpegaudio.h"
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#include "libavcodec/mpegaudiodecheader.h"
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/* mp3 read */
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static int mp3_read_probe(AVProbeData *p)
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{
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int max_frames, first_frames = 0;
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int fsize, frames, sample_rate;
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uint32_t header;
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uint8_t *buf, *buf0, *buf2, *end;
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AVCodecContext avctx;
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buf0 = p->buf;
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end = p->buf + p->buf_size - sizeof(uint32_t);
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while(buf0 < end && !*buf0)
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buf0++;
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max_frames = 0;
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buf = buf0;
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for(; buf < end; buf= buf2+1) {
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buf2 = buf;
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for(frames = 0; buf2 < end; frames++) {
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header = AV_RB32(buf2);
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fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
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if(fsize < 0)
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break;
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buf2 += fsize;
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}
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max_frames = FFMAX(max_frames, frames);
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if(buf == buf0)
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first_frames= frames;
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}
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// keep this in sync with ac3 probe, both need to avoid
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// issues with MPEG-files!
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if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
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else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
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else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
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else if(buf0!=p->buf) return AVPROBE_SCORE_MAX/4-1;
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else if(max_frames>=1) return 1;
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else return 0;
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//mpegps_mp3_unrecognized_format.mpg has max_frames=3
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}
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/**
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* Try to find Xing/Info/VBRI tags and compute duration from info therein
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*/
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static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
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{
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uint32_t v, spf;
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unsigned frames = 0; /* Total number of frames in file */
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unsigned size = 0; /* Total number of bytes in the stream */
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const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
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MPADecodeHeader c;
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int vbrtag_size = 0;
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v = get_be32(s->pb);
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if(ff_mpa_check_header(v) < 0)
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return -1;
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if (ff_mpegaudio_decode_header(&c, v) == 0)
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vbrtag_size = c.frame_size;
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if(c.layer != 3)
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return -1;
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/* Check for Xing / Info tag */
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url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
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v = get_be32(s->pb);
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if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
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v = get_be32(s->pb);
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if(v & 0x1)
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frames = get_be32(s->pb);
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if(v & 0x2)
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size = get_be32(s->pb);
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}
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/* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
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url_fseek(s->pb, base + 4 + 32, SEEK_SET);
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v = get_be32(s->pb);
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if(v == MKBETAG('V', 'B', 'R', 'I')) {
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/* Check tag version */
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if(get_be16(s->pb) == 1) {
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/* skip delay and quality */
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url_fseek(s->pb, 4, SEEK_CUR);
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frames = get_be32(s->pb);
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size = get_be32(s->pb);
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}
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}
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if(!frames && !size)
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return -1;
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/* Skip the vbr tag frame */
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url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
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spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
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if(frames)
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st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
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st->time_base);
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if(size)
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st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf);
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return 0;
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}
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static int mp3_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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int64_t off;
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_MP3;
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st->need_parsing = AVSTREAM_PARSE_FULL;
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st->start_time = 0;
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// lcm of all mp3 sample rates
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av_set_pts_info(st, 64, 1, 14112000);
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off = url_ftell(s->pb);
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if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
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ff_id3v1_read(s);
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if (mp3_parse_vbr_tags(s, st, off) < 0)
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url_fseek(s->pb, off, SEEK_SET);
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/* the parameters will be extracted from the compressed bitstream */
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return 0;
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}
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#define MP3_PACKET_SIZE 1024
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static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size;
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// AVStream *st = s->streams[0];
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size= MP3_PACKET_SIZE;
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ret= av_get_packet(s->pb, pkt, size);
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pkt->stream_index = 0;
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if (ret <= 0) {
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return AVERROR(EIO);
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}
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/* note: we need to modify the packet size here to handle the last
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packet */
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pkt->size = ret;
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return ret;
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}
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AVInputFormat mp3_demuxer = {
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"mp3",
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NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
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0,
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mp3_read_probe,
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mp3_read_header,
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mp3_read_packet,
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.flags= AVFMT_GENERIC_INDEX,
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.extensions = "mp2,mp3,m2a", /* XXX: use probe */
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};
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#endif
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#if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER
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static int id3v1_set_string(AVFormatContext *s, const char *key,
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uint8_t *buf, int buf_size)
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{
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AVMetadataTag *tag;
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if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
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strncpy(buf, tag->value, buf_size);
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return !!tag;
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}
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static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
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{
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AVMetadataTag *tag;
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int i, count = 0;
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memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
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buf[0] = 'T';
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buf[1] = 'A';
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buf[2] = 'G';
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count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title
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count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist
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count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
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count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
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count += id3v1_set_string(s, "comment", buf + 97, 30);
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if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
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buf[125] = 0;
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buf[126] = atoi(tag->value);
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count++;
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}
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buf[127] = 0xFF; /* default to unknown genre */
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if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
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for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
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if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
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buf[127] = i;
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count++;
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break;
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}
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}
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}
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return count;
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}
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/* simple formats */
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static void id3v2_put_size(AVFormatContext *s, int size)
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{
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put_byte(s->pb, size >> 21 & 0x7f);
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put_byte(s->pb, size >> 14 & 0x7f);
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put_byte(s->pb, size >> 7 & 0x7f);
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put_byte(s->pb, size & 0x7f);
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}
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static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
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uint32_t tag)
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{
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put_be32(s->pb, tag);
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id3v2_put_size(s, len + 1);
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put_be16(s->pb, 0);
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put_byte(s->pb, 3); /* UTF-8 */
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put_buffer(s->pb, buf, len);
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}
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static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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{
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put_buffer(s->pb, pkt->data, pkt->size);
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put_flush_packet(s->pb);
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return 0;
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}
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static int mp3_write_trailer(struct AVFormatContext *s)
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{
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uint8_t buf[ID3v1_TAG_SIZE];
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/* write the id3v1 tag */
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if (id3v1_create_tag(s, buf) > 0) {
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put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
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put_flush_packet(s->pb);
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}
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return 0;
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}
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#endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */
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#if CONFIG_MP2_MUXER
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AVOutputFormat mp2_muxer = {
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"mp2",
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NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
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"audio/x-mpeg",
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"mp2,m2a",
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0,
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CODEC_ID_MP2,
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CODEC_ID_NONE,
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NULL,
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mp3_write_packet,
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mp3_write_trailer,
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};
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#endif
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#if CONFIG_MP3_MUXER
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/**
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* Write an ID3v2.4 header at beginning of stream
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*/
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static int mp3_write_header(struct AVFormatContext *s)
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{
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AVMetadataTag *t = NULL;
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int totlen = 0;
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int64_t size_pos, cur_pos;
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put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
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put_byte(s->pb, 0);
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put_byte(s->pb, 0); /* flags */
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/* reserve space for size */
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size_pos = url_ftell(s->pb);
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put_be32(s->pb, 0);
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ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL);
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while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
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uint32_t tag = 0;
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if (t->key[0] == 'T' && strlen(t->key) == 4) {
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int i;
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for (i = 0; *ff_id3v2_tags[i]; i++)
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if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
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int len = strlen(t->value);
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tag = AV_RB32(t->key);
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totlen += len + ID3v2_HEADER_SIZE + 2;
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id3v2_put_ttag(s, t->value, len + 1, tag);
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break;
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}
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}
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if (!tag) { /* unknown tag, write as TXXX frame */
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int len = strlen(t->key), len1 = strlen(t->value);
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char *buf = av_malloc(len + len1 + 2);
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if (!buf)
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return AVERROR(ENOMEM);
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tag = MKBETAG('T', 'X', 'X', 'X');
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strcpy(buf, t->key);
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strcpy(buf + len + 1, t->value);
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id3v2_put_ttag(s, buf, len + len1 + 2, tag);
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totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
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av_free(buf);
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}
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}
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cur_pos = url_ftell(s->pb);
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url_fseek(s->pb, size_pos, SEEK_SET);
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id3v2_put_size(s, totlen);
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url_fseek(s->pb, cur_pos, SEEK_SET);
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return 0;
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}
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AVOutputFormat mp3_muxer = {
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"mp3",
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NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
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"audio/x-mpeg",
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"mp3",
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0,
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CODEC_ID_MP3,
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CODEC_ID_NONE,
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mp3_write_header,
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mp3_write_packet,
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mp3_write_trailer,
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AVFMT_NOTIMESTAMPS,
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};
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#endif
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