1 /*
2 * True Audio (TTA) muxer
3 * Copyright (c) 2016 James Almer
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
24
25 #include "apetag.h"
26 #include "avformat.h"
27 #include "avio_internal.h"
28 #include "internal.h"
29
30 typedef struct TTAMuxContext {
31 AVIOContext *seek_table;
32 AVPacketList *queue, *queue_end;
33 uint32_t nb_samples;
34 int frame_size;
35 int last_frame;
36 } TTAMuxContext;
37
tta_init(AVFormatContext * s)38 static int tta_init(AVFormatContext *s)
39 {
40 TTAMuxContext *tta = s->priv_data;
41 AVCodecParameters *par;
42
43 if (s->nb_streams != 1) {
44 av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
45 return AVERROR(EINVAL);
46 }
47 par = s->streams[0]->codecpar;
48
49 if (par->codec_id != AV_CODEC_ID_TTA) {
50 av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
51 return AVERROR(EINVAL);
52 }
53 if (par->extradata && par->extradata_size < 22) {
54 av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n");
55 return AVERROR_INVALIDDATA;
56 }
57
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);
62 }
63 tta->frame_size = par->sample_rate * 256 / 245;
64 avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate);
65
66 return 0;
67 }
68
tta_write_header(AVFormatContext * s)69 static int tta_write_header(AVFormatContext *s)
70 {
71 TTAMuxContext *tta = s->priv_data;
72 AVCodecParameters *par = s->streams[0]->codecpar;
73 int ret;
74
75 if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0)
76 return ret;
77
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);
87
88 return 0;
89 }
90
tta_write_packet(AVFormatContext * s,AVPacket * pkt)91 static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
92 {
93 TTAMuxContext *tta = s->priv_data;
94 int ret;
95
96 ret = ff_packet_list_put(&tta->queue, &tta->queue_end, pkt,
97 FF_PACKETLIST_FLAG_REF_PACKET);
98 if (ret < 0) {
99 return ret;
100 }
101
102 avio_wl32(tta->seek_table, pkt->size);
103 tta->nb_samples += pkt->duration;
104
105 if (tta->frame_size != pkt->duration) {
106 if (tta->last_frame) {
107 /* Two frames with a different duration than the default frame
108 size means the TTA stream comes from a faulty container, and
109 there's no way the last frame duration will be correct. */
110 av_log(s, AV_LOG_ERROR, "Invalid frame durations\n");
111
112 return AVERROR_INVALIDDATA;
113 }
114 /* First frame with a different duration than the default frame size.
115 Assume it's the last frame in the stream and continue. */
116 tta->last_frame++;
117 }
118
119 return 0;
120 }
121
tta_queue_flush(AVFormatContext * s)122 static void tta_queue_flush(AVFormatContext *s)
123 {
124 TTAMuxContext *tta = s->priv_data;
125 AVPacket pkt;
126
127 while (tta->queue) {
128 ff_packet_list_get(&tta->queue, &tta->queue_end, &pkt);
129 avio_write(s->pb, pkt.data, pkt.size);
130 av_packet_unref(&pkt);
131 }
132 }
133
tta_write_trailer(AVFormatContext * s)134 static int tta_write_trailer(AVFormatContext *s)
135 {
136 TTAMuxContext *tta = s->priv_data;
137 uint8_t *ptr;
138 unsigned int crc;
139 int size;
140
141 avio_wl32(s->pb, tta->nb_samples);
142 crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
143 avio_wl32(s->pb, crc);
144
145 /* Write Seek table */
146 crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX;
147 avio_wl32(tta->seek_table, crc);
148 size = avio_get_dyn_buf(tta->seek_table, &ptr);
149 avio_write(s->pb, ptr, size);
150
151 /* Write audio data */
152 tta_queue_flush(s);
153
154 ff_ape_write_tag(s);
155
156 return 0;
157 }
158
tta_deinit(AVFormatContext * s)159 static void tta_deinit(AVFormatContext *s)
160 {
161 TTAMuxContext *tta = s->priv_data;
162
163 ffio_free_dyn_buf(&tta->seek_table);
164 ff_packet_list_free(&tta->queue, &tta->queue_end);
165 }
166
167 AVOutputFormat ff_tta_muxer = {
168 .name = "tta",
169 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
170 .mime_type = "audio/x-tta",
171 .extensions = "tta",
172 .priv_data_size = sizeof(TTAMuxContext),
173 .audio_codec = AV_CODEC_ID_TTA,
174 .video_codec = AV_CODEC_ID_NONE,
175 .init = tta_init,
176 .deinit = tta_deinit,
177 .write_header = tta_write_header,
178 .write_packet = tta_write_packet,
179 .write_trailer = tta_write_trailer,
180 };
181