mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/*
|
|
* Copyright (c) 2021 Aidan Richmond
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Westwood Studios AUD file muxer
|
|
* by Aidan Richmond (aidan.is@hotmail.co.uk)
|
|
*
|
|
* This muxer supports IMA ADPCM packed in westwoods format.
|
|
*
|
|
* @see http://xhp.xwis.net/documents/aud3.txt
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "avio_internal.h"
|
|
#include "internal.h"
|
|
#include <stdint.h>
|
|
|
|
#define AUD_CHUNK_SIGNATURE 0x0000DEAF
|
|
|
|
typedef struct AUDMuxContext {
|
|
int uncomp_size;
|
|
int size;
|
|
} AUDMuxContext;
|
|
|
|
static int wsaud_write_init(AVFormatContext *ctx)
|
|
{
|
|
AVStream *st = ctx->streams[0];
|
|
AVIOContext *pb = ctx->pb;
|
|
|
|
/* Stream must be seekable to correctly write the file. */
|
|
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
|
|
av_log(ctx->streams[0], AV_LOG_ERROR, "Cannot write Westwood AUD to"
|
|
" non-seekable stream.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (st->codecpar->codec_id != AV_CODEC_ID_ADPCM_IMA_WS) {
|
|
av_log(st, AV_LOG_ERROR, "%s codec not supported for Westwood AUD.\n",
|
|
avcodec_get_name(st->codecpar->codec_id));
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (ctx->nb_streams != 1) {
|
|
av_log(st, AV_LOG_ERROR, "AUD files have exactly one stream\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wsaud_write_header(AVFormatContext *ctx)
|
|
{
|
|
AVStream *st = ctx->streams[0];
|
|
AVIOContext *pb = ctx->pb;
|
|
AUDMuxContext *a = ctx->priv_data;
|
|
unsigned char flags = 0;
|
|
|
|
a->uncomp_size = 0;
|
|
a->size = 0;
|
|
|
|
/* Flag if we have stereo data. */
|
|
if (st->codecpar->channels == 2)
|
|
flags |= 1;
|
|
|
|
/* This flags that the file contains 16 bit samples rather than 8 bit
|
|
since the encoder only encodes 16 bit samples this should be set. */
|
|
if (av_get_bits_per_sample(st->codecpar->codec_id) == 4)
|
|
flags |= 2;
|
|
|
|
avio_wl16(pb, st->codecpar->sample_rate);
|
|
/* We don't know the file size yet, so just zero 8 bytes */
|
|
ffio_fill(pb, 0, 8);
|
|
avio_w8(pb, flags);
|
|
/* 99 indicates the ADPCM format. Other formats not supported. */
|
|
avio_w8(pb, 99);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wsaud_write_packet(AVFormatContext *ctx, AVPacket *pkt)
|
|
{
|
|
AVIOContext *pb = ctx->pb;
|
|
AUDMuxContext *a = ctx->priv_data;
|
|
|
|
if (pkt->size > UINT16_MAX / 4)
|
|
return AVERROR_INVALIDDATA;
|
|
/* Assumes ADPCM since this muxer doesn't support SND1 or PCM format. */
|
|
avio_wl16(pb, pkt->size);
|
|
avio_wl16(pb, pkt->size * 4);
|
|
avio_wl32(pb, AUD_CHUNK_SIGNATURE);
|
|
avio_write(pb, pkt->data, pkt->size);
|
|
a->size += pkt->size + 8;
|
|
a->uncomp_size += pkt->size * 4;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wsaud_write_trailer(AVFormatContext *ctx)
|
|
{
|
|
AVIOContext *pb = ctx->pb;
|
|
AUDMuxContext *a = ctx->priv_data;
|
|
|
|
avio_seek(pb, 2, SEEK_SET);
|
|
avio_wl32(pb, a->size);
|
|
avio_wl32(pb, a->uncomp_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const AVOutputFormat ff_wsaud_muxer = {
|
|
.name = "wsaud",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios audio"),
|
|
.extensions = "aud",
|
|
.priv_data_size = sizeof(AUDMuxContext),
|
|
.audio_codec = AV_CODEC_ID_ADPCM_IMA_WS,
|
|
.video_codec = AV_CODEC_ID_NONE,
|
|
.init = wsaud_write_init,
|
|
.write_header = wsaud_write_header,
|
|
.write_packet = wsaud_write_packet,
|
|
.write_trailer = wsaud_write_trailer,
|
|
};
|