diff options
Diffstat (limited to 'libavformat/wvenc.c')
-rw-r--r-- | libavformat/wvenc.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/libavformat/wvenc.c b/libavformat/wvenc.c new file mode 100644 index 0000000000..03d471ecb6 --- /dev/null +++ b/libavformat/wvenc.c @@ -0,0 +1,144 @@ +/* + * WavPack muxer + * Copyright (c) 2012 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" +#include "avio_internal.h" +#include "apetag.h" + +#define WV_EXTRA_SIZE 12 +#define WV_END_BLOCK 0x1000 + +typedef struct{ + uint32_t duration; +} WVMuxContext; + +static int write_header(AVFormatContext *s) +{ + AVCodecContext *codec = s->streams[0]->codec; + + if (s->nb_streams > 1) { + av_log(s, AV_LOG_ERROR, "only one stream is supported\n"); + return AVERROR(EINVAL); + } + if (codec->codec_id != AV_CODEC_ID_WAVPACK) { + av_log(s, AV_LOG_ERROR, "unsupported codec\n"); + return AVERROR(EINVAL); + } + if (codec->extradata_size > 0) { + avpriv_report_missing_feature(s, "remuxing from matroska container"); + return AVERROR_PATCHWELCOME; + } + avpriv_set_pts_info(s->streams[0], 64, 1, codec->sample_rate); + + return 0; +} + +static int write_packet(AVFormatContext *s, AVPacket *pkt) +{ + WVMuxContext *wc = s->priv_data; + AVCodecContext *codec = s->streams[0]->codec; + AVIOContext *pb = s->pb; + uint64_t size; + uint32_t flags; + uint32_t left = pkt->size; + uint8_t *ptr = pkt->data; + int off = codec->channels > 2 ? 4 : 0; + + /* FIXME: Simplify decoder/demuxer so bellow code can support midstream + * change of stream parameters */ + wc->duration += pkt->duration; + ffio_wfourcc(pb, "wvpk"); + if (off) { + size = AV_RL32(pkt->data); + if (size <= 12) + return AVERROR_INVALIDDATA; + size -= 12; + } else { + size = pkt->size; + } + + if (size + off > left) + return AVERROR_INVALIDDATA; + + avio_wl32(pb, size + 12); + avio_wl16(pb, 0x410); + avio_w8(pb, 0); + avio_w8(pb, 0); + avio_wl32(pb, -1); + avio_wl32(pb, pkt->pts); + ptr += off; left -= off; + flags = AV_RL32(ptr + 4); + avio_write(pb, ptr, size); + ptr += size; left -= size; + + while (!(flags & WV_END_BLOCK) && + (left >= 4 + WV_EXTRA_SIZE)) { + ffio_wfourcc(pb, "wvpk"); + size = AV_RL32(ptr); + ptr += 4; left -= 4; + if (size < 24 || size - 24 > left) + return AVERROR_INVALIDDATA; + avio_wl32(pb, size); + avio_wl16(pb, 0x410); + avio_w8(pb, 0); + avio_w8(pb, 0); + avio_wl32(pb, -1); + avio_wl32(pb, pkt->pts); + flags = AV_RL32(ptr + 4); + avio_write(pb, ptr, WV_EXTRA_SIZE); + ptr += WV_EXTRA_SIZE; left -= WV_EXTRA_SIZE; + avio_write(pb, ptr, size - 24); + ptr += size - 24; left -= size - 24; + } + avio_flush(pb); + + return 0; +} + +static int write_trailer(AVFormatContext *s) +{ + WVMuxContext *wc = s->priv_data; + AVIOContext *pb = s->pb; + + ff_ape_write(s); + + if (pb->seekable) { + avio_seek(pb, 12, SEEK_SET); + avio_wl32(pb, wc->duration); + avio_flush(pb); + } + + return 0; +} + +AVOutputFormat ff_wv_muxer = { + .name = "wv", + .long_name = NULL_IF_CONFIG_SMALL("WavPack"), + .priv_data_size = sizeof(WVMuxContext), + .extensions = "wv", + .audio_codec = AV_CODEC_ID_WAVPACK, + .video_codec = AV_CODEC_ID_NONE, + .write_header = write_header, + .write_packet = write_packet, + .write_trailer = write_trailer, +}; |