592 lines
18 KiB
C
592 lines
18 KiB
C
/*
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* MP3 muxer
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "avformat.h"
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#include "avio_internal.h"
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#include "id3v1.h"
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#include "id3v2.h"
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#include "rawenc.h"
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#include "libavutil/avstring.h"
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#include "libavcodec/mpegaudio.h"
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#include "libavcodec/mpegaudiodata.h"
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#include "libavcodec/mpegaudiodecheader.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/dict.h"
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#include "libavutil/avassert.h"
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#include "libavutil/crc.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/replaygain.h"
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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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AVDictionaryEntry *tag;
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if ((tag = av_dict_get(s->metadata, key, NULL, 0)))
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av_strlcpy(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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AVDictionaryEntry *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_dict_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_dict_get(s->metadata, "TCON", NULL, 0))) { //genre
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for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
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if (!av_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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#define XING_NUM_BAGS 400
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#define XING_TOC_SIZE 100
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// size of the XING/LAME data, starting from the Xing tag
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#define XING_SIZE 156
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typedef struct MP3Context {
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const AVClass *class;
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ID3v2EncContext id3;
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int id3v2_version;
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int write_id3v1;
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int write_xing;
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/* xing header */
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// a buffer containing the whole XING/LAME frame
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uint8_t *xing_frame;
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int xing_frame_size;
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AVCRC audio_crc; // CRC of the audio data
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uint32_t audio_size; // total size of the audio data
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// offset of the XING/LAME frame in the file
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int64_t xing_frame_offset;
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// offset of the XING/INFO tag in the frame
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int xing_offset;
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int32_t frames;
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int32_t size;
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uint32_t want;
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uint32_t seen;
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uint32_t pos;
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uint64_t bag[XING_NUM_BAGS];
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int initial_bitrate;
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int has_variable_bitrate;
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/* index of the audio stream */
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int audio_stream_idx;
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/* number of attached pictures we still need to write */
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int pics_to_write;
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/* audio packets are queued here until we get all the attached pictures */
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AVPacketList *queue, *queue_end;
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} MP3Context;
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static const uint8_t xing_offtbl[2][2] = {{32, 17}, {17, 9}};
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/*
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* Write an empty XING header and initialize respective data.
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*/
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static void mp3_write_xing(AVFormatContext *s)
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{
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MP3Context *mp3 = s->priv_data;
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AVCodecContext *codec = s->streams[mp3->audio_stream_idx]->codec;
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AVDictionaryEntry *enc = av_dict_get(s->streams[mp3->audio_stream_idx]->metadata, "encoder", NULL, 0);
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AVIOContext *dyn_ctx;
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int32_t header;
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MPADecodeHeader mpah;
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int srate_idx, i, channels;
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int bitrate_idx;
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int best_bitrate_idx;
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int best_bitrate_error = INT_MAX;
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int ret;
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int ver = 0;
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int lsf, bytes_needed;
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if (!s->pb->seekable || !mp3->write_xing)
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return;
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for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++) {
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const uint16_t base_freq = avpriv_mpa_freq_tab[i];
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if (codec->sample_rate == base_freq) ver = 0x3; // MPEG 1
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else if (codec->sample_rate == base_freq / 2) ver = 0x2; // MPEG 2
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else if (codec->sample_rate == base_freq / 4) ver = 0x0; // MPEG 2.5
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else continue;
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srate_idx = i;
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break;
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}
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if (i == FF_ARRAY_ELEMS(avpriv_mpa_freq_tab)) {
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av_log(s, AV_LOG_WARNING, "Unsupported sample rate, not writing Xing "
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"header.\n");
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return;
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}
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switch (codec->channels) {
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case 1: channels = MPA_MONO; break;
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case 2: channels = MPA_STEREO; break;
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default: av_log(s, AV_LOG_WARNING, "Unsupported number of channels, "
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"not writing Xing header.\n");
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return;
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}
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/* dummy MPEG audio header */
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header = 0xff << 24; // sync
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header |= (0x7 << 5 | ver << 3 | 0x1 << 1 | 0x1) << 16; // sync/audio-version/layer 3/no crc*/
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header |= (srate_idx << 2) << 8;
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header |= channels << 6;
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lsf = !((header & (1 << 20) && header & (1 << 19)));
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mp3->xing_offset = xing_offtbl[ver != 3][channels == 1] + 4;
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bytes_needed = mp3->xing_offset + XING_SIZE;
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for (bitrate_idx = 1; bitrate_idx < 15; bitrate_idx++) {
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int bit_rate = 1000 * avpriv_mpa_bitrate_tab[lsf][3 - 1][bitrate_idx];
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int error = FFABS(bit_rate - codec->bit_rate);
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if (error < best_bitrate_error){
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best_bitrate_error = error;
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best_bitrate_idx = bitrate_idx;
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}
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}
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for (bitrate_idx = best_bitrate_idx; bitrate_idx < 15; bitrate_idx++) {
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int32_t mask = bitrate_idx << (4 + 8);
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header |= mask;
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avpriv_mpegaudio_decode_header(&mpah, header);
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if (bytes_needed <= mpah.frame_size)
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break;
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header &= ~mask;
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}
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ret = avio_open_dyn_buf(&dyn_ctx);
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if (ret < 0)
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return;
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avio_wb32(dyn_ctx, header);
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avpriv_mpegaudio_decode_header(&mpah, header);
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av_assert0(mpah.frame_size >= bytes_needed);
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ffio_fill(dyn_ctx, 0, mp3->xing_offset - 4);
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ffio_wfourcc(dyn_ctx, "Xing");
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avio_wb32(dyn_ctx, 0x01 | 0x02 | 0x04 | 0x08); // frames / size / TOC / vbr scale
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mp3->size = mpah.frame_size;
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mp3->want = 1;
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avio_wb32(dyn_ctx, 0); // frames
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avio_wb32(dyn_ctx, 0); // size
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// TOC
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for (i = 0; i < XING_TOC_SIZE; i++)
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avio_w8(dyn_ctx, 255 * i / XING_TOC_SIZE);
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// vbr quality
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// we write it, because some (broken) tools always expect it to be present
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avio_wb32(dyn_ctx, 0);
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// encoder short version string
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if (enc) {
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uint8_t encoder_str[9] = { 0 };
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memcpy(encoder_str, enc->value, FFMIN(strlen(enc->value), sizeof(encoder_str)));
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avio_write(dyn_ctx, encoder_str, sizeof(encoder_str));
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} else
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ffio_fill(dyn_ctx, 0, 9);
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avio_w8(dyn_ctx, 0); // tag revision 0 / unknown vbr method
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avio_w8(dyn_ctx, 0); // unknown lowpass filter value
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ffio_fill(dyn_ctx, 0, 8); // empty replaygain fields
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avio_w8(dyn_ctx, 0); // unknown encoding flags
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avio_w8(dyn_ctx, 0); // unknown abr/minimal bitrate
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// encoder delay
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if (codec->initial_padding >= 1 << 12) {
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av_log(s, AV_LOG_WARNING, "Too many samples of initial padding.\n");
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avio_wb24(dyn_ctx, 0);
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} else {
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avio_wb24(dyn_ctx, codec->initial_padding << 12);
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}
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avio_w8(dyn_ctx, 0); // misc
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avio_w8(dyn_ctx, 0); // mp3gain
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avio_wb16(dyn_ctx, 0); // preset
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// audio length and CRCs (will be updated later)
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avio_wb32(dyn_ctx, 0); // music length
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avio_wb16(dyn_ctx, 0); // music crc
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avio_wb16(dyn_ctx, 0); // tag crc
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ffio_fill(dyn_ctx, 0, mpah.frame_size - bytes_needed);
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mp3->xing_frame_size = avio_close_dyn_buf(dyn_ctx, &mp3->xing_frame);
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mp3->xing_frame_offset = avio_tell(s->pb);
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avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
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mp3->audio_size = mp3->xing_frame_size;
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}
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/*
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* Add a frame to XING data.
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* Following lame's "VbrTag.c".
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*/
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static void mp3_xing_add_frame(MP3Context *mp3, AVPacket *pkt)
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{
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int i;
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mp3->frames++;
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mp3->seen++;
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mp3->size += pkt->size;
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if (mp3->want == mp3->seen) {
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mp3->bag[mp3->pos] = mp3->size;
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if (XING_NUM_BAGS == ++mp3->pos) {
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/* shrink table to half size by throwing away each second bag. */
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for (i = 1; i < XING_NUM_BAGS; i += 2)
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mp3->bag[i / 2] = mp3->bag[i];
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/* double wanted amount per bag. */
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mp3->want *= 2;
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/* adjust current position to half of table size. */
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mp3->pos = XING_NUM_BAGS / 2;
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}
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mp3->seen = 0;
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}
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}
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static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
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{
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MP3Context *mp3 = s->priv_data;
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if (mp3->xing_offset && pkt->size >= 4) {
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MPADecodeHeader c;
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uint32_t h;
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h = AV_RB32(pkt->data);
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if (ff_mpa_check_header(h) == 0) {
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avpriv_mpegaudio_decode_header(&c, h);
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if (!mp3->initial_bitrate)
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mp3->initial_bitrate = c.bit_rate;
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if ((c.bit_rate == 0) || (mp3->initial_bitrate != c.bit_rate))
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mp3->has_variable_bitrate = 1;
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}
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mp3_xing_add_frame(mp3, pkt);
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if (mp3->xing_offset) {
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mp3->audio_size += pkt->size;
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mp3->audio_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE),
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mp3->audio_crc, pkt->data, pkt->size);
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}
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}
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return ff_raw_write_packet(s, pkt);
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}
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static int mp3_queue_flush(AVFormatContext *s)
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{
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MP3Context *mp3 = s->priv_data;
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AVPacketList *pktl;
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int ret = 0, write = 1;
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ff_id3v2_finish(&mp3->id3, s->pb);
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mp3_write_xing(s);
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while ((pktl = mp3->queue)) {
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if (write && (ret = mp3_write_audio_packet(s, &pktl->pkt)) < 0)
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write = 0;
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av_free_packet(&pktl->pkt);
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mp3->queue = pktl->next;
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av_freep(&pktl);
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}
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mp3->queue_end = NULL;
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return ret;
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}
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static void mp3_update_xing(AVFormatContext *s)
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{
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MP3Context *mp3 = s->priv_data;
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AVReplayGain *rg;
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uint16_t tag_crc;
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uint8_t *toc;
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int i, rg_size;
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/* replace "Xing" identification string with "Info" for CBR files. */
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if (!mp3->has_variable_bitrate)
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AV_WL32(mp3->xing_frame + mp3->xing_offset, MKTAG('I', 'n', 'f', 'o'));
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AV_WB32(mp3->xing_frame + mp3->xing_offset + 8, mp3->frames);
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AV_WB32(mp3->xing_frame + mp3->xing_offset + 12, mp3->size);
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toc = mp3->xing_frame + mp3->xing_offset + 16;
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toc[0] = 0; // first toc entry has to be zero.
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for (i = 1; i < XING_TOC_SIZE; ++i) {
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int j = i * mp3->pos / XING_TOC_SIZE;
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int seek_point = 256LL * mp3->bag[j] / mp3->size;
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toc[i] = FFMIN(seek_point, 255);
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}
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/* write replaygain */
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rg = (AVReplayGain*)av_stream_get_side_data(s->streams[0], AV_PKT_DATA_REPLAYGAIN,
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&rg_size);
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if (rg && rg_size >= sizeof(*rg)) {
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uint16_t val;
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AV_WB32(mp3->xing_frame + mp3->xing_offset + 131,
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av_rescale(rg->track_peak, 1 << 23, 100000));
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if (rg->track_gain != INT32_MIN) {
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val = FFABS(rg->track_gain / 10000) & ((1 << 9) - 1);
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val |= (rg->track_gain < 0) << 9;
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val |= 1 << 13;
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AV_WB16(mp3->xing_frame + mp3->xing_offset + 135, val);
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}
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if (rg->album_gain != INT32_MIN) {
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val = FFABS(rg->album_gain / 10000) & ((1 << 9) - 1);
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val |= (rg->album_gain < 0) << 9;
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val |= 1 << 14;
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AV_WB16(mp3->xing_frame + mp3->xing_offset + 137, val);
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}
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}
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AV_WB32(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 8, mp3->audio_size);
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AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 4, mp3->audio_crc);
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tag_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), 0, mp3->xing_frame, 190);
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AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 2, tag_crc);
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avio_seek(s->pb, mp3->xing_frame_offset, SEEK_SET);
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avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
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avio_seek(s->pb, 0, SEEK_END);
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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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MP3Context *mp3 = s->priv_data;
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if (mp3->pics_to_write) {
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av_log(s, AV_LOG_WARNING, "No packets were sent for some of the "
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"attached pictures.\n");
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mp3_queue_flush(s);
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}
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/* write the id3v1 tag */
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if (mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
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avio_write(s->pb, buf, ID3v1_TAG_SIZE);
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}
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if (mp3->xing_offset)
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mp3_update_xing(s);
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av_freep(&mp3->xing_frame);
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return 0;
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}
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#if CONFIG_MP2_MUXER
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AVOutputFormat ff_mp2_muxer = {
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.name = "mp2",
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.long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
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.mime_type = "audio/x-mpeg",
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.extensions = "mp2,m2a,mpa",
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.audio_codec = AV_CODEC_ID_MP2,
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.video_codec = AV_CODEC_ID_NONE,
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.write_packet = ff_raw_write_packet,
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.flags = AVFMT_NOTIMESTAMPS,
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};
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#endif
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#if CONFIG_MP3_MUXER
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static const AVOption options[] = {
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{ "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
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offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM},
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{ "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
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offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
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{ "write_xing", "Write the Xing header containing file duration.",
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offsetof(MP3Context, write_xing), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass mp3_muxer_class = {
|
|
.class_name = "MP3 muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
MP3Context *mp3 = s->priv_data;
|
|
|
|
if (pkt->stream_index == mp3->audio_stream_idx) {
|
|
if (mp3->pics_to_write) {
|
|
/* buffer audio packets until we get all the pictures */
|
|
AVPacketList *pktl = av_mallocz(sizeof(*pktl));
|
|
if (!pktl)
|
|
return AVERROR(ENOMEM);
|
|
|
|
pktl->pkt = *pkt;
|
|
pktl->pkt.buf = av_buffer_ref(pkt->buf);
|
|
if (!pktl->pkt.buf) {
|
|
av_freep(&pktl);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
if (mp3->queue_end)
|
|
mp3->queue_end->next = pktl;
|
|
else
|
|
mp3->queue = pktl;
|
|
mp3->queue_end = pktl;
|
|
} else
|
|
return mp3_write_audio_packet(s, pkt);
|
|
} else {
|
|
int ret;
|
|
|
|
/* warn only once for each stream */
|
|
if (s->streams[pkt->stream_index]->nb_frames == 1) {
|
|
av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
|
|
" ignoring.\n", pkt->stream_index);
|
|
}
|
|
if (!mp3->pics_to_write || s->streams[pkt->stream_index]->nb_frames >= 1)
|
|
return 0;
|
|
|
|
if ((ret = ff_id3v2_write_apic(s, &mp3->id3, pkt)) < 0)
|
|
return ret;
|
|
mp3->pics_to_write--;
|
|
|
|
/* flush the buffered audio packets */
|
|
if (!mp3->pics_to_write &&
|
|
(ret = mp3_queue_flush(s)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Write an ID3v2 header at beginning of stream
|
|
*/
|
|
|
|
static int mp3_write_header(struct AVFormatContext *s)
|
|
{
|
|
MP3Context *mp3 = s->priv_data;
|
|
int ret, i;
|
|
|
|
if (mp3->id3v2_version &&
|
|
mp3->id3v2_version != 3 &&
|
|
mp3->id3v2_version != 4) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid ID3v2 version requested: %d. Only "
|
|
"3, 4 or 0 (disabled) are allowed.\n", mp3->id3v2_version);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
/* check the streams -- we want exactly one audio and arbitrary number of
|
|
* video (attached pictures) */
|
|
mp3->audio_stream_idx = -1;
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
|
|
if (mp3->audio_stream_idx >= 0 || st->codec->codec_id != AV_CODEC_ID_MP3) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one MP3 "
|
|
"audio stream is required.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
mp3->audio_stream_idx = i;
|
|
} else if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
|
|
av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in MP3.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
}
|
|
if (mp3->audio_stream_idx < 0) {
|
|
av_log(s, AV_LOG_ERROR, "No audio stream present.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
mp3->pics_to_write = s->nb_streams - 1;
|
|
|
|
if (mp3->pics_to_write && !mp3->id3v2_version) {
|
|
av_log(s, AV_LOG_ERROR, "Attached pictures were requested, but the "
|
|
"ID3v2 header is disabled.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (mp3->id3v2_version) {
|
|
ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
|
|
ret = ff_id3v2_write_metadata(s, &mp3->id3);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (!mp3->pics_to_write) {
|
|
if (mp3->id3v2_version)
|
|
ff_id3v2_finish(&mp3->id3, s->pb);
|
|
mp3_write_xing(s);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_mp3_muxer = {
|
|
.name = "mp3",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
|
|
.mime_type = "audio/x-mpeg",
|
|
.extensions = "mp3",
|
|
.priv_data_size = sizeof(MP3Context),
|
|
.audio_codec = AV_CODEC_ID_MP3,
|
|
.video_codec = AV_CODEC_ID_PNG,
|
|
.write_header = mp3_write_header,
|
|
.write_packet = mp3_write_packet,
|
|
.write_trailer = mp3_write_trailer,
|
|
.flags = AVFMT_NOTIMESTAMPS,
|
|
.priv_class = &mp3_muxer_class,
|
|
};
|
|
#endif
|