From d08928bbea2b495596c2d3bc7df3cfb3e3b2b7e3 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Fri, 21 Jan 2011 13:53:46 +0000 Subject: Split mp3 demuxer and muxer into separate files. Signed-off-by: Mans Rullgard --- libavformat/Makefile | 6 +- libavformat/mp3.c | 368 --------------------------------------------------- libavformat/mp3dec.c | 192 +++++++++++++++++++++++++++ libavformat/mp3enc.c | 194 +++++++++++++++++++++++++++ 4 files changed, 389 insertions(+), 371 deletions(-) delete mode 100644 libavformat/mp3.c create mode 100644 libavformat/mp3dec.c create mode 100644 libavformat/mp3enc.c diff --git a/libavformat/Makefile b/libavformat/Makefile index d3c849a..dd13bb4 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -129,9 +129,9 @@ OBJS-$(CONFIG_MMF_DEMUXER) += mmf.o pcm.o OBJS-$(CONFIG_MMF_MUXER) += mmf.o riff.o OBJS-$(CONFIG_MOV_DEMUXER) += mov.o riff.o isom.o OBJS-$(CONFIG_MOV_MUXER) += movenc.o riff.o isom.o avc.o movenchint.o -OBJS-$(CONFIG_MP2_MUXER) += mp3.o -OBJS-$(CONFIG_MP3_DEMUXER) += mp3.o -OBJS-$(CONFIG_MP3_MUXER) += mp3.o +OBJS-$(CONFIG_MP2_MUXER) += mp3enc.o +OBJS-$(CONFIG_MP3_DEMUXER) += mp3dec.o +OBJS-$(CONFIG_MP3_MUXER) += mp3enc.o OBJS-$(CONFIG_MPC_DEMUXER) += mpc.o apetag.o OBJS-$(CONFIG_MPC8_DEMUXER) += mpc8.o OBJS-$(CONFIG_MPEG1SYSTEM_MUXER) += mpegenc.o diff --git a/libavformat/mp3.c b/libavformat/mp3.c deleted file mode 100644 index e70a120..0000000 --- a/libavformat/mp3.c +++ /dev/null @@ -1,368 +0,0 @@ -/* - * MP3 muxer and demuxer - * Copyright (c) 2003 Fabrice Bellard - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include -#include "libavutil/avstring.h" -#include "libavutil/intreadwrite.h" -#include "avformat.h" -#include "id3v2.h" -#include "id3v1.h" - -#if CONFIG_MP3_DEMUXER - -#include "libavcodec/mpegaudio.h" -#include "libavcodec/mpegaudiodecheader.h" - -/* mp3 read */ - -static int mp3_read_probe(AVProbeData *p) -{ - int max_frames, first_frames = 0; - int fsize, frames, sample_rate; - uint32_t header; - uint8_t *buf, *buf0, *buf2, *end; - AVCodecContext avctx; - - buf0 = p->buf; - end = p->buf + p->buf_size - sizeof(uint32_t); - while(buf0 < end && !*buf0) - buf0++; - - max_frames = 0; - buf = buf0; - - for(; buf < end; buf= buf2+1) { - buf2 = buf; - - for(frames = 0; buf2 < end; frames++) { - header = AV_RB32(buf2); - fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate); - if(fsize < 0) - break; - buf2 += fsize; - } - max_frames = FFMAX(max_frames, frames); - if(buf == buf0) - first_frames= frames; - } - // keep this in sync with ac3 probe, both need to avoid - // issues with MPEG-files! - if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1; - else if(max_frames>500)return AVPROBE_SCORE_MAX/2; - else if(max_frames>=4) return AVPROBE_SCORE_MAX/4; - else if(max_frames>=1) return 1; - else return 0; -//mpegps_mp3_unrecognized_format.mpg has max_frames=3 -} - -/** - * Try to find Xing/Info/VBRI tags and compute duration from info therein - */ -static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) -{ - uint32_t v, spf; - unsigned frames = 0; /* Total number of frames in file */ - unsigned size = 0; /* Total number of bytes in the stream */ - const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}}; - MPADecodeHeader c; - int vbrtag_size = 0; - - v = get_be32(s->pb); - if(ff_mpa_check_header(v) < 0) - return -1; - - if (ff_mpegaudio_decode_header(&c, v) == 0) - vbrtag_size = c.frame_size; - if(c.layer != 3) - return -1; - - /* Check for Xing / Info tag */ - url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR); - v = get_be32(s->pb); - if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) { - v = get_be32(s->pb); - if(v & 0x1) - frames = get_be32(s->pb); - if(v & 0x2) - size = get_be32(s->pb); - } - - /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */ - url_fseek(s->pb, base + 4 + 32, SEEK_SET); - v = get_be32(s->pb); - if(v == MKBETAG('V', 'B', 'R', 'I')) { - /* Check tag version */ - if(get_be16(s->pb) == 1) { - /* skip delay and quality */ - url_fseek(s->pb, 4, SEEK_CUR); - frames = get_be32(s->pb); - size = get_be32(s->pb); - } - } - - if(!frames && !size) - return -1; - - /* Skip the vbr tag frame */ - url_fseek(s->pb, base + vbrtag_size, SEEK_SET); - - spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */ - if(frames) - st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate}, - st->time_base); - if(size && frames) - st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf); - - return 0; -} - -static int mp3_read_header(AVFormatContext *s, - AVFormatParameters *ap) -{ - AVStream *st; - int64_t off; - - st = av_new_stream(s, 0); - if (!st) - return AVERROR(ENOMEM); - - st->codec->codec_type = AVMEDIA_TYPE_AUDIO; - st->codec->codec_id = CODEC_ID_MP3; - st->need_parsing = AVSTREAM_PARSE_FULL; - st->start_time = 0; - - // lcm of all mp3 sample rates - av_set_pts_info(st, 64, 1, 14112000); - - off = url_ftell(s->pb); - - if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX)) - ff_id3v1_read(s); - - if (mp3_parse_vbr_tags(s, st, off) < 0) - url_fseek(s->pb, off, SEEK_SET); - - /* the parameters will be extracted from the compressed bitstream */ - return 0; -} - -#define MP3_PACKET_SIZE 1024 - -static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt) -{ - int ret, size; - // AVStream *st = s->streams[0]; - - size= MP3_PACKET_SIZE; - - ret= av_get_packet(s->pb, pkt, size); - - pkt->stream_index = 0; - if (ret <= 0) { - return AVERROR(EIO); - } - /* note: we need to modify the packet size here to handle the last - packet */ - pkt->size = ret; - return ret; -} - -AVInputFormat mp3_demuxer = { - "mp3", - NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"), - 0, - mp3_read_probe, - mp3_read_header, - mp3_read_packet, - .flags= AVFMT_GENERIC_INDEX, - .extensions = "mp2,mp3,m2a", /* XXX: use probe */ -}; -#endif - -#if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER -static int id3v1_set_string(AVFormatContext *s, const char *key, - uint8_t *buf, int buf_size) -{ - AVMetadataTag *tag; - if ((tag = av_metadata_get(s->metadata, key, NULL, 0))) - strncpy(buf, tag->value, buf_size); - return !!tag; -} - -static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf) -{ - AVMetadataTag *tag; - int i, count = 0; - - memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */ - buf[0] = 'T'; - buf[1] = 'A'; - buf[2] = 'G'; - count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title - count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist - count += id3v1_set_string(s, "TALB", buf + 63, 30); //album - count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date - count += id3v1_set_string(s, "comment", buf + 97, 30); - if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track - buf[125] = 0; - buf[126] = atoi(tag->value); - count++; - } - buf[127] = 0xFF; /* default to unknown genre */ - if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre - for(i = 0; i <= ID3v1_GENRE_MAX; i++) { - if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) { - buf[127] = i; - count++; - break; - } - } - } - return count; -} - -/* simple formats */ - -static void id3v2_put_size(AVFormatContext *s, int size) -{ - put_byte(s->pb, size >> 21 & 0x7f); - put_byte(s->pb, size >> 14 & 0x7f); - put_byte(s->pb, size >> 7 & 0x7f); - put_byte(s->pb, size & 0x7f); -} - -static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len, - uint32_t tag) -{ - put_be32(s->pb, tag); - id3v2_put_size(s, len + 1); - put_be16(s->pb, 0); - put_byte(s->pb, 3); /* UTF-8 */ - put_buffer(s->pb, buf, len); -} - - -static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt) -{ - put_buffer(s->pb, pkt->data, pkt->size); - put_flush_packet(s->pb); - return 0; -} - -static int mp3_write_trailer(struct AVFormatContext *s) -{ - uint8_t buf[ID3v1_TAG_SIZE]; - - /* write the id3v1 tag */ - if (id3v1_create_tag(s, buf) > 0) { - put_buffer(s->pb, buf, ID3v1_TAG_SIZE); - put_flush_packet(s->pb); - } - return 0; -} -#endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */ - -#if CONFIG_MP2_MUXER -AVOutputFormat mp2_muxer = { - "mp2", - NULL_IF_CONFIG_SMALL("MPEG audio layer 2"), - "audio/x-mpeg", - "mp2,m2a", - 0, - CODEC_ID_MP2, - CODEC_ID_NONE, - NULL, - mp3_write_packet, - mp3_write_trailer, -}; -#endif - -#if CONFIG_MP3_MUXER -/** - * Write an ID3v2.4 header at beginning of stream - */ - -static int mp3_write_header(struct AVFormatContext *s) -{ - AVMetadataTag *t = NULL; - int totlen = 0; - int64_t size_pos, cur_pos; - - put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */ - put_byte(s->pb, 0); - put_byte(s->pb, 0); /* flags */ - - /* reserve space for size */ - size_pos = url_ftell(s->pb); - put_be32(s->pb, 0); - - ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL); - while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) { - uint32_t tag = 0; - - if (t->key[0] == 'T' && strlen(t->key) == 4) { - int i; - for (i = 0; *ff_id3v2_tags[i]; i++) - if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) { - int len = strlen(t->value); - tag = AV_RB32(t->key); - totlen += len + ID3v2_HEADER_SIZE + 2; - id3v2_put_ttag(s, t->value, len + 1, tag); - break; - } - } - - if (!tag) { /* unknown tag, write as TXXX frame */ - int len = strlen(t->key), len1 = strlen(t->value); - char *buf = av_malloc(len + len1 + 2); - if (!buf) - return AVERROR(ENOMEM); - tag = MKBETAG('T', 'X', 'X', 'X'); - strcpy(buf, t->key); - strcpy(buf + len + 1, t->value); - id3v2_put_ttag(s, buf, len + len1 + 2, tag); - totlen += len + len1 + ID3v2_HEADER_SIZE + 3; - av_free(buf); - } - } - - cur_pos = url_ftell(s->pb); - url_fseek(s->pb, size_pos, SEEK_SET); - id3v2_put_size(s, totlen); - url_fseek(s->pb, cur_pos, SEEK_SET); - - return 0; -} - -AVOutputFormat mp3_muxer = { - "mp3", - NULL_IF_CONFIG_SMALL("MPEG audio layer 3"), - "audio/x-mpeg", - "mp3", - 0, - CODEC_ID_MP3, - CODEC_ID_NONE, - mp3_write_header, - mp3_write_packet, - mp3_write_trailer, - AVFMT_NOTIMESTAMPS, -}; -#endif diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c new file mode 100644 index 0000000..ab6aabe --- /dev/null +++ b/libavformat/mp3dec.c @@ -0,0 +1,192 @@ +/* + * MP3 demuxer + * Copyright (c) 2003 Fabrice Bellard + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/avstring.h" +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "id3v2.h" +#include "id3v1.h" +#include "libavcodec/mpegaudiodecheader.h" + +/* mp3 read */ + +static int mp3_read_probe(AVProbeData *p) +{ + int max_frames, first_frames = 0; + int fsize, frames, sample_rate; + uint32_t header; + uint8_t *buf, *buf0, *buf2, *end; + AVCodecContext avctx; + + buf0 = p->buf; + end = p->buf + p->buf_size - sizeof(uint32_t); + while(buf0 < end && !*buf0) + buf0++; + + max_frames = 0; + buf = buf0; + + for(; buf < end; buf= buf2+1) { + buf2 = buf; + + for(frames = 0; buf2 < end; frames++) { + header = AV_RB32(buf2); + fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate); + if(fsize < 0) + break; + buf2 += fsize; + } + max_frames = FFMAX(max_frames, frames); + if(buf == buf0) + first_frames= frames; + } + // keep this in sync with ac3 probe, both need to avoid + // issues with MPEG-files! + if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1; + else if(max_frames>500)return AVPROBE_SCORE_MAX/2; + else if(max_frames>=4) return AVPROBE_SCORE_MAX/4; + else if(max_frames>=1) return 1; + else return 0; +//mpegps_mp3_unrecognized_format.mpg has max_frames=3 +} + +/** + * Try to find Xing/Info/VBRI tags and compute duration from info therein + */ +static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) +{ + uint32_t v, spf; + unsigned frames = 0; /* Total number of frames in file */ + unsigned size = 0; /* Total number of bytes in the stream */ + const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}}; + MPADecodeHeader c; + int vbrtag_size = 0; + + v = get_be32(s->pb); + if(ff_mpa_check_header(v) < 0) + return -1; + + if (ff_mpegaudio_decode_header(&c, v) == 0) + vbrtag_size = c.frame_size; + if(c.layer != 3) + return -1; + + /* Check for Xing / Info tag */ + url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR); + v = get_be32(s->pb); + if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) { + v = get_be32(s->pb); + if(v & 0x1) + frames = get_be32(s->pb); + if(v & 0x2) + size = get_be32(s->pb); + } + + /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */ + url_fseek(s->pb, base + 4 + 32, SEEK_SET); + v = get_be32(s->pb); + if(v == MKBETAG('V', 'B', 'R', 'I')) { + /* Check tag version */ + if(get_be16(s->pb) == 1) { + /* skip delay and quality */ + url_fseek(s->pb, 4, SEEK_CUR); + frames = get_be32(s->pb); + size = get_be32(s->pb); + } + } + + if(!frames && !size) + return -1; + + /* Skip the vbr tag frame */ + url_fseek(s->pb, base + vbrtag_size, SEEK_SET); + + spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */ + if(frames) + st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate}, + st->time_base); + if(size && frames) + st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf); + + return 0; +} + +static int mp3_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + AVStream *st; + int64_t off; + + st = av_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = CODEC_ID_MP3; + st->need_parsing = AVSTREAM_PARSE_FULL; + st->start_time = 0; + + // lcm of all mp3 sample rates + av_set_pts_info(st, 64, 1, 14112000); + + off = url_ftell(s->pb); + + if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX)) + ff_id3v1_read(s); + + if (mp3_parse_vbr_tags(s, st, off) < 0) + url_fseek(s->pb, off, SEEK_SET); + + /* the parameters will be extracted from the compressed bitstream */ + return 0; +} + +#define MP3_PACKET_SIZE 1024 + +static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int ret, size; + // AVStream *st = s->streams[0]; + + size= MP3_PACKET_SIZE; + + ret= av_get_packet(s->pb, pkt, size); + + pkt->stream_index = 0; + if (ret <= 0) { + return AVERROR(EIO); + } + /* note: we need to modify the packet size here to handle the last + packet */ + pkt->size = ret; + return ret; +} + +AVInputFormat mp3_demuxer = { + "mp3", + NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"), + 0, + mp3_read_probe, + mp3_read_header, + mp3_read_packet, + .flags= AVFMT_GENERIC_INDEX, + .extensions = "mp2,mp3,m2a", /* XXX: use probe */ +}; diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c new file mode 100644 index 0000000..b4fb876 --- /dev/null +++ b/libavformat/mp3enc.c @@ -0,0 +1,194 @@ +/* + * MP3 muxer + * Copyright (c) 2003 Fabrice Bellard + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include "avformat.h" +#include "id3v1.h" +#include "id3v2.h" +#include "libavutil/intreadwrite.h" + +static int id3v1_set_string(AVFormatContext *s, const char *key, + uint8_t *buf, int buf_size) +{ + AVMetadataTag *tag; + if ((tag = av_metadata_get(s->metadata, key, NULL, 0))) + strncpy(buf, tag->value, buf_size); + return !!tag; +} + +static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf) +{ + AVMetadataTag *tag; + int i, count = 0; + + memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */ + buf[0] = 'T'; + buf[1] = 'A'; + buf[2] = 'G'; + count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title + count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist + count += id3v1_set_string(s, "TALB", buf + 63, 30); //album + count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date + count += id3v1_set_string(s, "comment", buf + 97, 30); + if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track + buf[125] = 0; + buf[126] = atoi(tag->value); + count++; + } + buf[127] = 0xFF; /* default to unknown genre */ + if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre + for(i = 0; i <= ID3v1_GENRE_MAX; i++) { + if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) { + buf[127] = i; + count++; + break; + } + } + } + return count; +} + +/* simple formats */ + +static void id3v2_put_size(AVFormatContext *s, int size) +{ + put_byte(s->pb, size >> 21 & 0x7f); + put_byte(s->pb, size >> 14 & 0x7f); + put_byte(s->pb, size >> 7 & 0x7f); + put_byte(s->pb, size & 0x7f); +} + +static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len, + uint32_t tag) +{ + put_be32(s->pb, tag); + id3v2_put_size(s, len + 1); + put_be16(s->pb, 0); + put_byte(s->pb, 3); /* UTF-8 */ + put_buffer(s->pb, buf, len); +} + + +static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt) +{ + put_buffer(s->pb, pkt->data, pkt->size); + put_flush_packet(s->pb); + return 0; +} + +static int mp3_write_trailer(struct AVFormatContext *s) +{ + uint8_t buf[ID3v1_TAG_SIZE]; + + /* write the id3v1 tag */ + if (id3v1_create_tag(s, buf) > 0) { + put_buffer(s->pb, buf, ID3v1_TAG_SIZE); + put_flush_packet(s->pb); + } + return 0; +} + +#if CONFIG_MP2_MUXER +AVOutputFormat mp2_muxer = { + "mp2", + NULL_IF_CONFIG_SMALL("MPEG audio layer 2"), + "audio/x-mpeg", + "mp2,m2a", + 0, + CODEC_ID_MP2, + CODEC_ID_NONE, + NULL, + mp3_write_packet, + mp3_write_trailer, +}; +#endif + +#if CONFIG_MP3_MUXER +/** + * Write an ID3v2.4 header at beginning of stream + */ + +static int mp3_write_header(struct AVFormatContext *s) +{ + AVMetadataTag *t = NULL; + int totlen = 0; + int64_t size_pos, cur_pos; + + put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */ + put_byte(s->pb, 0); + put_byte(s->pb, 0); /* flags */ + + /* reserve space for size */ + size_pos = url_ftell(s->pb); + put_be32(s->pb, 0); + + ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL); + while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) { + uint32_t tag = 0; + + if (t->key[0] == 'T' && strlen(t->key) == 4) { + int i; + for (i = 0; *ff_id3v2_tags[i]; i++) + if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) { + int len = strlen(t->value); + tag = AV_RB32(t->key); + totlen += len + ID3v2_HEADER_SIZE + 2; + id3v2_put_ttag(s, t->value, len + 1, tag); + break; + } + } + + if (!tag) { /* unknown tag, write as TXXX frame */ + int len = strlen(t->key), len1 = strlen(t->value); + char *buf = av_malloc(len + len1 + 2); + if (!buf) + return AVERROR(ENOMEM); + tag = MKBETAG('T', 'X', 'X', 'X'); + strcpy(buf, t->key); + strcpy(buf + len + 1, t->value); + id3v2_put_ttag(s, buf, len + len1 + 2, tag); + totlen += len + len1 + ID3v2_HEADER_SIZE + 3; + av_free(buf); + } + } + + cur_pos = url_ftell(s->pb); + url_fseek(s->pb, size_pos, SEEK_SET); + id3v2_put_size(s, totlen); + url_fseek(s->pb, cur_pos, SEEK_SET); + + return 0; +} + +AVOutputFormat mp3_muxer = { + "mp3", + NULL_IF_CONFIG_SMALL("MPEG audio layer 3"), + "audio/x-mpeg", + "mp3", + 0, + CODEC_ID_MP3, + CODEC_ID_NONE, + mp3_write_header, + mp3_write_packet, + mp3_write_trailer, + AVFMT_NOTIMESTAMPS, +}; +#endif -- cgit v1.1