mirror of
https://github.com/FFmpeg/FFmpeg.git
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246 lines
7.3 KiB
C
246 lines
7.3 KiB
C
/*
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* Argonaut Games CVG demuxer
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*
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* Copyright (C) 2021 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 "libavutil/intreadwrite.h"
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/*
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* .CVG files are essentially PSX ADPCM wrapped with a size and checksum.
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* Found in the PSX versions of the game.
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*/
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#define ARGO_CVG_HEADER_SIZE 12
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#define ARGO_CVG_BLOCK_ALIGN 0x10
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#define ARGO_CVG_NB_BLOCKS 32
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#define ARGO_CVG_SAMPLES_PER_BLOCK 28
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typedef struct ArgoCVGHeader {
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uint32_t size; /*< File size -8 (this + trailing checksum) */
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uint32_t unk1; /*< Unknown. Always seems to be 0 or 1. */
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uint32_t unk2; /*< Unknown. Always seems to be 0 or 1. */
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} ArgoCVGHeader;
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typedef struct ArgoCVGOverride {
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const char *name;
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ArgoCVGHeader header;
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uint32_t checksum;
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int sample_rate;
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} ArgoCVGOverride;
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typedef struct ArgoCVGDemuxContext {
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ArgoCVGHeader header;
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uint32_t checksum;
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uint32_t num_blocks;
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uint32_t blocks_read;
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} ArgoCVGDemuxContext;
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/* "Special" files that are played at a different rate. */
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static ArgoCVGOverride overrides[] = {
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{ "CRYS.CVG", { 23592, 0, 1 }, 2495499, 88200 }, /* Beta */
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{ "REDCRY88.CVG", { 38280, 0, 1 }, 4134848, 88200 }, /* Beta */
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{ "DANLOOP1.CVG", { 54744, 1, 0 }, 5684641, 37800 }, /* Beta */
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{ "PICKUP88.CVG", { 12904, 0, 1 }, 1348091, 48000 }, /* Beta */
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{ "SELECT1.CVG", { 5080, 0, 1 }, 549987, 44100 }, /* Beta */
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};
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static int argo_cvg_probe(const AVProbeData *p)
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{
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ArgoCVGHeader cvg;
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/*
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* It's almost impossible to detect these files based
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* on the header alone. File extension is (unfortunately)
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* the best way forward.
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*/
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if (!av_match_ext(p->filename, "cvg"))
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return 0;
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if (p->buf_size < ARGO_CVG_HEADER_SIZE)
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return 0;
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cvg.size = AV_RL32(p->buf + 0);
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cvg.unk1 = AV_RL32(p->buf + 4);
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cvg.unk2 = AV_RL32(p->buf + 8);
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if (cvg.size < 8)
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return 0;
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if (cvg.unk1 != 0 && cvg.unk1 != 1)
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return 0;
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if (cvg.unk2 != 0 && cvg.unk2 != 1)
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return 0;
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return AVPROBE_SCORE_MAX / 4 + 1;
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}
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static int argo_cvg_read_checksum(AVIOContext *pb, const ArgoCVGHeader *cvg, uint32_t *checksum)
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{
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int ret;
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uint8_t buf[4];
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if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
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*checksum = 0;
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return 0;
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}
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if ((ret = avio_seek(pb, cvg->size + 4, SEEK_SET)) < 0)
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return ret;
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/* NB: Not using avio_rl32() because no error checking. */
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if ((ret = avio_read(pb, buf, sizeof(buf))) < 0)
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return ret;
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else if (ret != sizeof(buf))
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return AVERROR(EIO);
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if ((ret = avio_seek(pb, ARGO_CVG_HEADER_SIZE, SEEK_SET)) < 0)
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return ret;
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*checksum = AV_RL32(buf);
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return 0;
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}
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static int argo_cvg_read_header(AVFormatContext *s)
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{
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int ret;
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AVStream *st;
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AVCodecParameters *par;
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uint8_t buf[ARGO_CVG_HEADER_SIZE];
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const char *filename = av_basename(s->url);
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ArgoCVGDemuxContext *ctx = s->priv_data;
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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, ARGO_CVG_HEADER_SIZE)) < 0)
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return ret;
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else if (ret != ARGO_CVG_HEADER_SIZE)
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return AVERROR(EIO);
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ctx->header.size = AV_RL32(buf + 0);
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ctx->header.unk1 = AV_RL32(buf + 4);
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ctx->header.unk2 = AV_RL32(buf + 8);
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if (ctx->header.size < 8)
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return AVERROR_INVALIDDATA;
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av_log(s, AV_LOG_TRACE, "size = %u\n", ctx->header.size);
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av_log(s, AV_LOG_TRACE, "unk = %u, %u\n", ctx->header.unk1, ctx->header.unk2);
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if ((ret = argo_cvg_read_checksum(s->pb, &ctx->header, &ctx->checksum)) < 0)
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return ret;
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av_log(s, AV_LOG_TRACE, "checksum = %u\n", ctx->checksum);
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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_PSX;
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par->sample_rate = 22050;
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for (size_t i = 0; i < FF_ARRAY_ELEMS(overrides); i++) {
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const ArgoCVGOverride *ovr = overrides + i;
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if (ovr->header.size != ctx->header.size ||
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ovr->header.unk1 != ctx->header.unk1 ||
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ovr->header.unk2 != ctx->header.unk2 ||
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ovr->checksum != ctx->checksum ||
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av_strcasecmp(filename, ovr->name) != 0)
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continue;
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av_log(s, AV_LOG_TRACE, "found override, name = %s\n", ovr->name);
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par->sample_rate = ovr->sample_rate;
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break;
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}
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par->channels = 1;
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par->channel_layout = AV_CH_LAYOUT_MONO;
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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 = ARGO_CVG_BLOCK_ALIGN;
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par->bit_rate = par->sample_rate * par->bits_per_coded_sample;
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ctx->num_blocks = (ctx->header.size - 8) / ARGO_CVG_BLOCK_ALIGN;
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av_log(s, AV_LOG_TRACE, "num blocks = %u\n", ctx->num_blocks);
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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 = ctx->num_blocks * ARGO_CVG_SAMPLES_PER_BLOCK;
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st->nb_frames = ctx->num_blocks;
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return 0;
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}
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static int argo_cvg_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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AVStream *st = s->streams[0];
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ArgoCVGDemuxContext *ctx = s->priv_data;
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if (ctx->blocks_read >= ctx->num_blocks)
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return AVERROR_EOF;
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ret = av_get_packet(s->pb, pkt, st->codecpar->block_align *
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FFMIN(ARGO_CVG_NB_BLOCKS, ctx->num_blocks - ctx->blocks_read));
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if (ret < 0)
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return ret;
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if (ret % st->codecpar->block_align != 0)
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return AVERROR_INVALIDDATA;
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pkt->stream_index = 0;
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pkt->duration = ARGO_CVG_SAMPLES_PER_BLOCK * (ret / st->codecpar->block_align);
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pkt->pts = ctx->blocks_read * ARGO_CVG_SAMPLES_PER_BLOCK;
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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ctx->blocks_read += ret / st->codecpar->block_align;
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return 0;
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}
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static int argo_cvg_seek(AVFormatContext *s, int stream_index,
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int64_t pts, int flags)
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{
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int64_t ret;
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ArgoCVGDemuxContext *ctx = s->priv_data;
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if (pts != 0 || stream_index != 0)
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return AVERROR(EINVAL);
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if ((ret = avio_seek(s->pb, ARGO_CVG_HEADER_SIZE, SEEK_SET)) < 0)
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return ret;
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ctx->blocks_read = 0;
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return 0;
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}
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const AVInputFormat ff_argo_cvg_demuxer = {
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.name = "argo_cvg",
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.long_name = NULL_IF_CONFIG_SMALL("Argonaut Games CVG"),
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.priv_data_size = sizeof(ArgoCVGDemuxContext),
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.read_probe = argo_cvg_probe,
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.read_header = argo_cvg_read_header,
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.read_packet = argo_cvg_read_packet,
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.read_seek = argo_cvg_seek,
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};
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