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
29typedef struct WvMuxContext {
30    int64_t samples;
31} WvMuxContext;
32
33static av_cold int wv_write_header(AVFormatContext *ctx)
34{
35    if (ctx->nb_streams > 1 ||
36        ctx->streams[0]->codec->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
44static 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
62static 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 && 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
79AVOutputFormat 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