92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* WavPack muxer
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* Copyright (c) 2013 Konstantin Shishkov <kostya.shishkov@gmail.com>
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/attributes.h"
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#include "apetag.h"
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#include "avformat.h"
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#include "wv.h"
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typedef struct WvMuxContext {
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int64_t samples;
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} WvMuxContext;
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static av_cold int wv_write_header(AVFormatContext *ctx)
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{
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if (ctx->nb_streams > 1 ||
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ctx->streams[0]->codecpar->codec_id != AV_CODEC_ID_WAVPACK) {
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av_log(ctx, AV_LOG_ERROR, "This muxer only supports a single WavPack stream.\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt)
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{
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WvMuxContext *s = ctx->priv_data;
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WvHeader header;
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int ret;
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if (pkt->size < WV_HEADER_SIZE ||
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(ret = ff_wv_parse_header(&header, pkt->data)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid WavPack packet.\n");
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return AVERROR(EINVAL);
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}
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s->samples += header.samples;
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avio_write(ctx->pb, pkt->data, pkt->size);
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return 0;
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}
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static av_cold int wv_write_trailer(AVFormatContext *ctx)
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{
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WvMuxContext *s = ctx->priv_data;
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/* update total number of samples in the first block */
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if ((ctx->pb->seekable & AVIO_SEEKABLE_NORMAL) && s->samples &&
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s->samples < UINT32_MAX) {
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int64_t pos = avio_tell(ctx->pb);
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avio_seek(ctx->pb, 12, SEEK_SET);
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avio_wl32(ctx->pb, s->samples);
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avio_seek(ctx->pb, pos, SEEK_SET);
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}
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ff_ape_write_tag(ctx);
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return 0;
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}
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AVOutputFormat ff_wv_muxer = {
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.name = "wv",
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.long_name = NULL_IF_CONFIG_SMALL("raw WavPack"),
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.mime_type = "audio/x-wavpack",
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.extensions = "wv",
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.priv_data_size = sizeof(WvMuxContext),
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.audio_codec = AV_CODEC_ID_WAVPACK,
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.video_codec = AV_CODEC_ID_NONE,
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.write_header = wv_write_header,
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.write_packet = wv_write_packet,
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.write_trailer = wv_write_trailer,
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.flags = AVFMT_NOTIMESTAMPS,
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};
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