2 * True Audio (TTA) muxer
3 * Copyright (c) 2016 James Almer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
27 #include "avio_internal.h"
30 typedef struct TTAMuxContext {
31 AVIOContext *seek_table;
32 AVPacketList *queue, *queue_end;
38 static int tta_init(AVFormatContext *s)
40 TTAMuxContext *tta = s->priv_data;
41 AVCodecParameters *par;
43 if (s->nb_streams != 1) {
44 av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
45 return AVERROR(EINVAL);
47 par = s->streams[0]->codecpar;
49 if (par->codec_id != AV_CODEC_ID_TTA) {
50 av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
51 return AVERROR(EINVAL);
53 if (par->extradata && par->extradata_size < 22) {
54 av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n");
55 return AVERROR_INVALIDDATA;
58 /* Prevent overflow */
59 if (par->sample_rate > 0x7FFFFFu) {
60 av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
61 return AVERROR(EINVAL);
63 tta->frame_size = par->sample_rate * 256 / 245;
64 avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate);
69 static int tta_write_header(AVFormatContext *s)
71 TTAMuxContext *tta = s->priv_data;
72 AVCodecParameters *par = s->streams[0]->codecpar;
75 if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0)
78 /* Ignore most extradata information if present. It can be innacurate
79 if for example remuxing from Matroska */
80 ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
81 ffio_init_checksum(tta->seek_table, ff_crcEDB88320_update, UINT32_MAX);
82 avio_write(s->pb, "TTA1", 4);
83 avio_wl16(s->pb, par->extradata ? AV_RL16(par->extradata + 4) : 1);
84 avio_wl16(s->pb, par->channels);
85 avio_wl16(s->pb, par->bits_per_raw_sample);
86 avio_wl32(s->pb, par->sample_rate);
91 static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
93 TTAMuxContext *tta = s->priv_data;
94 AVPacketList *pktl = av_mallocz(sizeof(*pktl));
98 return AVERROR(ENOMEM);
100 ret = av_packet_ref(&pktl->pkt, pkt);
106 tta->queue_end->next = pktl;
109 tta->queue_end = pktl;
111 avio_wl32(tta->seek_table, pkt->size);
112 tta->nb_samples += pkt->duration;
114 if (tta->frame_size != pkt->duration) {
115 if (tta->last_frame) {
116 /* Two frames with a different duration than the default frame
117 size means the TTA stream comes from a faulty container, and
118 there's no way the last frame duration will be correct. */
119 av_log(s, AV_LOG_ERROR, "Invalid frame durations\n");
121 return AVERROR_INVALIDDATA;
123 /* First frame with a different duration than the default frame size.
124 Assume it's the last frame in the stream and continue. */
131 static void tta_queue_flush(AVFormatContext *s)
133 TTAMuxContext *tta = s->priv_data;
136 while (pktl = tta->queue) {
137 AVPacket *pkt = &pktl->pkt;
138 avio_write(s->pb, pkt->data, pkt->size);
139 av_packet_unref(pkt);
140 tta->queue = pktl->next;
143 tta->queue_end = NULL;
146 static int tta_write_trailer(AVFormatContext *s)
148 TTAMuxContext *tta = s->priv_data;
153 avio_wl32(s->pb, tta->nb_samples);
154 crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
155 avio_wl32(s->pb, crc);
157 /* Write Seek table */
158 crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX;
159 avio_wl32(tta->seek_table, crc);
160 size = avio_close_dyn_buf(tta->seek_table, &ptr);
161 avio_write(s->pb, ptr, size);
164 /* Write audio data */
173 AVOutputFormat ff_tta_muxer = {
175 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
176 .mime_type = "audio/x-tta",
178 .priv_data_size = sizeof(TTAMuxContext),
179 .audio_codec = AV_CODEC_ID_TTA,
180 .video_codec = AV_CODEC_ID_NONE,
182 .write_header = tta_write_header,
183 .write_packet = tta_write_packet,
184 .write_trailer = tta_write_trailer,