mirror of https://git.ffmpeg.org/ffmpeg.git
143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/*
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* Copyright (c) 2021 Aidan Richmond
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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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/**
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* @file
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* Westwood Studios AUD file muxer
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* by Aidan Richmond (aidan.is@hotmail.co.uk)
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*
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* This muxer supports IMA ADPCM packed in westwoods format.
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*
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* @see http://xhp.xwis.net/documents/aud3.txt
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*/
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#include "libavutil/avassert.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include <stdint.h>
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#define AUD_CHUNK_SIGNATURE 0x0000DEAF
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typedef struct AUDMuxContext {
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int uncomp_size;
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int size;
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} AUDMuxContext;
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static int wsaud_write_init(AVFormatContext *ctx)
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{
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AVStream *st = ctx->streams[0];
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AVIOContext *pb = ctx->pb;
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/* Stream must be seekable to correctly write the file. */
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if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
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av_log(ctx->streams[0], AV_LOG_ERROR, "Cannot write Westwood AUD to"
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" non-seekable stream.\n");
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return AVERROR(EINVAL);
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}
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if (st->codecpar->codec_id != AV_CODEC_ID_ADPCM_IMA_WS) {
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av_log(st, AV_LOG_ERROR, "%s codec not supported for Westwood AUD.\n",
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avcodec_get_name(st->codecpar->codec_id));
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return AVERROR(EINVAL);
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}
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if (ctx->nb_streams != 1) {
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av_log(st, AV_LOG_ERROR, "AUD files have exactly one 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 wsaud_write_header(AVFormatContext *ctx)
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{
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AVStream *st = ctx->streams[0];
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AVIOContext *pb = ctx->pb;
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AUDMuxContext *a = ctx->priv_data;
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int ret;
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unsigned char flags = 0;
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a->uncomp_size = 0;
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a->size = 0;
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/* Flag if we have stereo data. */
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if (st->codecpar->channels == 2)
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flags |= 1;
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/* This flags that the file contains 16 bit samples rather than 8 bit
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since the encoder only encodes 16 bit samples this should be set. */
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if (av_get_bits_per_sample(st->codecpar->codec_id) == 4)
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flags |= 2;
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avio_wl16(pb, st->codecpar->sample_rate);
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/* We don't know the file size yet, so just zero 8 bytes */
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ffio_fill(pb, 0, 8);
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avio_w8(pb, flags);
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/* 99 indicates the ADPCM format. Other formats not supported. */
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avio_w8(pb, 99);
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return 0;
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}
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static int wsaud_write_packet(AVFormatContext *ctx, AVPacket *pkt)
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{
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AVIOContext *pb = ctx->pb;
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AUDMuxContext *a = ctx->priv_data;
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if (pkt->size > UINT16_MAX / 4)
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return AVERROR_INVALIDDATA;
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/* Assumes ADPCM since this muxer doesn't support SND1 or PCM format. */
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avio_wl16(pb, pkt->size);
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avio_wl16(pb, pkt->size * 4);
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avio_wl32(pb, AUD_CHUNK_SIGNATURE);
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avio_write(pb, pkt->data, pkt->size);
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a->size += pkt->size + 8;
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a->uncomp_size += pkt->size * 4;
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return 0;
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}
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static int wsaud_write_trailer(AVFormatContext *ctx)
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{
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AVIOContext *pb = ctx->pb;
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AUDMuxContext *a = ctx->priv_data;
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avio_seek(pb, 2, SEEK_SET);
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avio_wl32(pb, a->size);
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avio_wl32(pb, a->uncomp_size);
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return 0;
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}
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AVOutputFormat ff_wsaud_muxer = {
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.name = "wsaud",
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.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios audio"),
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.extensions = "aud",
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.priv_data_size = sizeof(AUDMuxContext),
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.audio_codec = AV_CODEC_ID_ADPCM_IMA_WS,
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.video_codec = AV_CODEC_ID_NONE,
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.init = wsaud_write_init,
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.write_header = wsaud_write_header,
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.write_packet = wsaud_write_packet,
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.write_trailer = wsaud_write_trailer,
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};
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