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/*
* True Audio (TTA) muxer
* Copyright (c) 2016 James Almer
*
* 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/crc.h"
#include "libavutil/intreadwrite.h"
#include "apetag.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
typedef struct TTAMuxContext {
AVIOContext *seek_table;
AVIOContext *data;
uint32_t nb_samples;
int frame_size;
int last_frame;
} TTAMuxContext;
static int tta_write_header(AVFormatContext *s)
{
TTAMuxContext *tta = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
int ret;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
return AVERROR(EINVAL);
}
if (par->codec_id != AV_CODEC_ID_TTA) {
av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
return AVERROR(EINVAL);
}
if (par->extradata && par->extradata_size < 22) {
av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n");
return AVERROR_INVALIDDATA;
}
if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0)
return ret;
if ((ret = avio_open_dyn_buf(&tta->data)) < 0) {
ffio_free_dyn_buf(&tta->seek_table);
return ret;
}
/* Ignore most extradata information if present. It can be innacurate
if for example remuxing from Matroska */
ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
ffio_init_checksum(tta->seek_table, ff_crcEDB88320_update, UINT32_MAX);
avio_write(s->pb, "TTA1", 4);
avio_wl16(s->pb, par->extradata ? AV_RL16(par->extradata + 4) : 1);
avio_wl16(s->pb, par->channels);
avio_wl16(s->pb, par->bits_per_raw_sample);
avio_wl32(s->pb, par->sample_rate);
/* Prevent overflow */
if (par->sample_rate > 0x7FFFFFu) {
av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
return AVERROR(EINVAL);
}
tta->frame_size = par->sample_rate * 256 / 245;
avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate);
return 0;
}
static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
{
TTAMuxContext *tta = s->priv_data;
avio_write(tta->data, pkt->data, pkt->size);
avio_wl32(tta->seek_table, pkt->size);
tta->nb_samples += pkt->duration;
if (tta->frame_size != pkt->duration) {
if (tta->last_frame) {
/* Two frames with a different duration than the default frame
size means the TTA stream comes from a faulty container, and
there's no way the last frame duration will be correct. */
av_log(s, AV_LOG_ERROR, "Invalid frame durations\n");
return AVERROR_INVALIDDATA;
}
/* First frame with a different duration than the default frame size.
Assume it's the last frame in the stream and continue. */
tta->last_frame++;
}
return 0;
}
static int tta_write_trailer(AVFormatContext *s)
{
TTAMuxContext *tta = s->priv_data;
uint8_t *ptr;
unsigned int crc;
int size;
avio_wl32(s->pb, tta->nb_samples);
crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
avio_wl32(s->pb, crc);
/* Write Seek table */
crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX;
avio_wl32(tta->seek_table, crc);
size = avio_close_dyn_buf(tta->seek_table, &ptr);
avio_write(s->pb, ptr, size);
av_free(ptr);
/* Write audio data */
size = avio_close_dyn_buf(tta->data, &ptr);
avio_write(s->pb, ptr, size);
av_free(ptr);
ff_ape_write_tag(s);
avio_flush(s->pb);
return 0;
}
AVOutputFormat ff_tta_muxer = {
.name = "tta",
.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
.mime_type = "audio/x-tta",
.extensions = "tta",
.priv_data_size = sizeof(TTAMuxContext),
.audio_codec = AV_CODEC_ID_TTA,
.video_codec = AV_CODEC_ID_NONE,
.write_header = tta_write_header,
.write_packet = tta_write_packet,
.write_trailer = tta_write_trailer,
};
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