early-access version 1432
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pineappleEA
197
externals/ffmpeg/libavformat/kvag.c
vendored
Executable file
197
externals/ffmpeg/libavformat/kvag.c
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/*
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* Simon & Schuster Interactive VAG (de)muxer
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*
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* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
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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 "avformat.h"
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#include "internal.h"
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#include "rawenc.h"
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#include "libavutil/intreadwrite.h"
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#define KVAG_TAG MKTAG('K', 'V', 'A', 'G')
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#define KVAG_HEADER_SIZE 14
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#define KVAG_MAX_READ_SIZE 4096
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typedef struct KVAGHeader {
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uint32_t magic;
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uint32_t data_size;
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uint32_t sample_rate;
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uint16_t stereo;
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} KVAGHeader;
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#if CONFIG_KVAG_DEMUXER
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static int kvag_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != KVAG_TAG)
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return 0;
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return AVPROBE_SCORE_EXTENSION + 1;
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}
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static int kvag_read_header(AVFormatContext *s)
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{
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int ret;
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AVStream *st;
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KVAGHeader hdr;
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AVCodecParameters *par;
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uint8_t buf[KVAG_HEADER_SIZE];
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if (!(st = avformat_new_stream(s, NULL)))
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return AVERROR(ENOMEM);
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if ((ret = avio_read(s->pb, buf, KVAG_HEADER_SIZE)) < 0)
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return ret;
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else if (ret != KVAG_HEADER_SIZE)
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return AVERROR(EIO);
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hdr.magic = AV_RL32(buf + 0);
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hdr.data_size = AV_RL32(buf + 4);
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hdr.sample_rate = AV_RL32(buf + 8);
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hdr.stereo = AV_RL16(buf + 12);
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par = st->codecpar;
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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par->codec_id = AV_CODEC_ID_ADPCM_IMA_SSI;
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par->format = AV_SAMPLE_FMT_S16;
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if (hdr.stereo) {
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par->channel_layout = AV_CH_LAYOUT_STEREO;
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par->channels = 2;
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} else {
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par->channel_layout = AV_CH_LAYOUT_MONO;
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par->channels = 1;
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}
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par->sample_rate = hdr.sample_rate;
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par->bits_per_coded_sample = 4;
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par->bits_per_raw_sample = 16;
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par->block_align = 1;
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par->bit_rate = par->channels *
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par->sample_rate *
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par->bits_per_coded_sample;
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avpriv_set_pts_info(st, 64, 1, par->sample_rate);
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st->start_time = 0;
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st->duration = hdr.data_size *
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(8 / par->bits_per_coded_sample) /
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par->channels;
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return 0;
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}
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static int kvag_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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AVCodecParameters *par = s->streams[0]->codecpar;
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if ((ret = av_get_packet(s->pb, pkt, KVAG_MAX_READ_SIZE)) < 0)
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return ret;
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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pkt->stream_index = 0;
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pkt->duration = ret * (8 / par->bits_per_coded_sample) / par->channels;
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return 0;
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}
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AVInputFormat ff_kvag_demuxer = {
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.name = "kvag",
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.long_name = NULL_IF_CONFIG_SMALL("Simon & Schuster Interactive VAG"),
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.read_probe = kvag_probe,
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.read_header = kvag_read_header,
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.read_packet = kvag_read_packet
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};
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#endif
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#if CONFIG_KVAG_MUXER
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static int kvag_write_init(AVFormatContext *s)
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{
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AVCodecParameters *par;
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if (s->nb_streams != 1) {
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av_log(s, AV_LOG_ERROR, "KVAG files have exactly one stream\n");
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return AVERROR(EINVAL);
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}
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par = s->streams[0]->codecpar;
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if (par->codec_id != AV_CODEC_ID_ADPCM_IMA_SSI) {
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av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
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avcodec_get_name(par->codec_id));
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return AVERROR(EINVAL);
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}
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if (par->channels > 2) {
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av_log(s, AV_LOG_ERROR, "KVAG files only support up to 2 channels\n");
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return AVERROR(EINVAL);
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}
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if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
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av_log(s, AV_LOG_WARNING, "Stream not seekable, unable to write output file\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 kvag_write_header(AVFormatContext *s)
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{
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uint8_t buf[KVAG_HEADER_SIZE];
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AVCodecParameters *par = s->streams[0]->codecpar;
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AV_WL32(buf + 0, KVAG_TAG);
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AV_WL32(buf + 4, 0); /* Data size, we fix this up later. */
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AV_WL32(buf + 8, par->sample_rate);
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AV_WL16(buf + 12, par->channels == 2);
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avio_write(s->pb, buf, sizeof(buf));
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return 0;
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}
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static int kvag_write_trailer(AVFormatContext *s)
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{
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int64_t file_size, data_size;
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file_size = avio_tell(s->pb);
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data_size = file_size - KVAG_HEADER_SIZE;
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if (data_size < UINT32_MAX) {
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avio_seek(s->pb, 4, SEEK_SET);
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avio_wl32(s->pb, (uint32_t)data_size);
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avio_seek(s->pb, file_size, SEEK_SET);
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} else {
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av_log(s, AV_LOG_WARNING,
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"Filesize %"PRId64" invalid for KVAG, output file will be broken\n",
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file_size);
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}
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return 0;
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}
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AVOutputFormat ff_kvag_muxer = {
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.name = "kvag",
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.long_name = NULL_IF_CONFIG_SMALL("Simon & Schuster Interactive VAG"),
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.extensions = "vag",
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.audio_codec = AV_CODEC_ID_ADPCM_IMA_SSI,
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.video_codec = AV_CODEC_ID_NONE,
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.init = kvag_write_init,
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.write_header = kvag_write_header,
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.write_packet = ff_raw_write_packet,
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.write_trailer = kvag_write_trailer
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};
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#endif
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