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