mirror of
https://git.ffmpeg.org/ffmpeg.git
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145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/*
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* WavPack muxer
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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/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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#include "apetag.h"
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#define WV_EXTRA_SIZE 12
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#define WV_END_BLOCK 0x1000
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typedef struct{
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uint32_t duration;
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} WVMuxContext;
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static int write_header(AVFormatContext *s)
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{
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AVCodecContext *codec = s->streams[0]->codec;
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if (s->nb_streams > 1) {
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av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
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return AVERROR(EINVAL);
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}
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if (codec->codec_id != AV_CODEC_ID_WAVPACK) {
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av_log(s, AV_LOG_ERROR, "unsupported codec\n");
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return AVERROR(EINVAL);
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}
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if (codec->extradata_size > 0) {
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av_log_missing_feature(s, "remuxing from matroska container", 0);
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return AVERROR_PATCHWELCOME;
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}
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avpriv_set_pts_info(s->streams[0], 64, 1, codec->sample_rate);
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return 0;
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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WVMuxContext *wc = s->priv_data;
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AVCodecContext *codec = s->streams[0]->codec;
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AVIOContext *pb = s->pb;
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uint64_t size;
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uint32_t flags;
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uint32_t left = pkt->size;
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uint8_t *ptr = pkt->data;
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int off = codec->channels > 2 ? 4 : 0;
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/* FIXME: Simplify decoder/demuxer so bellow code can support midstream
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* change of stream parameters */
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wc->duration += pkt->duration;
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ffio_wfourcc(pb, "wvpk");
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if (off) {
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size = AV_RL32(pkt->data);
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if (size <= 12)
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return AVERROR_INVALIDDATA;
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size -= 12;
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} else {
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size = pkt->size;
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}
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if (size + off > left)
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return AVERROR_INVALIDDATA;
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avio_wl32(pb, size + 12);
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avio_wl16(pb, 0x410);
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avio_w8(pb, 0);
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avio_w8(pb, 0);
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avio_wl32(pb, -1);
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avio_wl32(pb, pkt->pts);
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ptr += off; left -= off;
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flags = AV_RL32(ptr + 4);
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avio_write(pb, ptr, size);
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ptr += size; left -= size;
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while (!(flags & WV_END_BLOCK) &&
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(left >= 4 + WV_EXTRA_SIZE)) {
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ffio_wfourcc(pb, "wvpk");
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size = AV_RL32(ptr);
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ptr += 4; left -= 4;
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if (size < 24 || size - 24 > left)
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return AVERROR_INVALIDDATA;
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avio_wl32(pb, size);
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avio_wl16(pb, 0x410);
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avio_w8(pb, 0);
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avio_w8(pb, 0);
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avio_wl32(pb, -1);
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avio_wl32(pb, pkt->pts);
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flags = AV_RL32(ptr + 4);
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avio_write(pb, ptr, WV_EXTRA_SIZE);
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ptr += WV_EXTRA_SIZE; left -= WV_EXTRA_SIZE;
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avio_write(pb, ptr, size - 24);
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ptr += size - 24; left -= size - 24;
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}
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avio_flush(pb);
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return 0;
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}
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static int write_trailer(AVFormatContext *s)
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{
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WVMuxContext *wc = s->priv_data;
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AVIOContext *pb = s->pb;
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ff_ape_write(s);
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if (pb->seekable) {
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avio_seek(pb, 12, SEEK_SET);
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avio_wl32(pb, wc->duration);
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avio_flush(pb);
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}
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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("WavPack"),
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.priv_data_size = sizeof(WVMuxContext),
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.extensions = "wv",
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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 = write_header,
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.write_packet = write_packet,
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.write_trailer = write_trailer,
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};
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