1 /*
2 * WavPack muxer
3 * Copyright (c) 2013 Konstantin Shishkov <kostya.shishkov@gmail.com>
4 * Copyright (c) 2012 Paul B Mahol
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "libavutil/attributes.h"
24
25 #include "apetag.h"
26 #include "avformat.h"
27 #include "wv.h"
28
29 typedef struct WvMuxContext {
30 int64_t samples;
31 } WvMuxContext;
32
wv_write_header(AVFormatContext * ctx)33 static av_cold int wv_write_header(AVFormatContext *ctx)
34 {
35 if (ctx->nb_streams > 1 ||
36 ctx->streams[0]->codecpar->codec_id != AV_CODEC_ID_WAVPACK) {
37 av_log(ctx, AV_LOG_ERROR, "This muxer only supports a single WavPack stream.\n");
38 return AVERROR(EINVAL);
39 }
40
41 return 0;
42 }
43
wv_write_packet(AVFormatContext * ctx,AVPacket * pkt)44 static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt)
45 {
46 WvMuxContext *s = ctx->priv_data;
47 WvHeader header;
48 int ret;
49
50 if (pkt->size < WV_HEADER_SIZE ||
51 (ret = ff_wv_parse_header(&header, pkt->data)) < 0) {
52 av_log(ctx, AV_LOG_ERROR, "Invalid WavPack packet.\n");
53 return AVERROR(EINVAL);
54 }
55 s->samples += header.samples;
56
57 avio_write(ctx->pb, pkt->data, pkt->size);
58
59 return 0;
60 }
61
wv_write_trailer(AVFormatContext * ctx)62 static av_cold int wv_write_trailer(AVFormatContext *ctx)
63 {
64 WvMuxContext *s = ctx->priv_data;
65
66 /* update total number of samples in the first block */
67 if ((ctx->pb->seekable & AVIO_SEEKABLE_NORMAL) && s->samples &&
68 s->samples < UINT32_MAX) {
69 int64_t pos = avio_tell(ctx->pb);
70 avio_seek(ctx->pb, 12, SEEK_SET);
71 avio_wl32(ctx->pb, s->samples);
72 avio_seek(ctx->pb, pos, SEEK_SET);
73 }
74
75 ff_ape_write_tag(ctx);
76 return 0;
77 }
78
79 AVOutputFormat ff_wv_muxer = {
80 .name = "wv",
81 .long_name = NULL_IF_CONFIG_SMALL("raw WavPack"),
82 .mime_type = "audio/x-wavpack",
83 .extensions = "wv",
84 .priv_data_size = sizeof(WvMuxContext),
85 .audio_codec = AV_CODEC_ID_WAVPACK,
86 .video_codec = AV_CODEC_ID_NONE,
87 .write_header = wv_write_header,
88 .write_packet = wv_write_packet,
89 .write_trailer = wv_write_trailer,
90 .flags = AVFMT_NOTIMESTAMPS,
91 };
92