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FFmpeg/libavformat/argo_asf.c
Zane van Iperen dc3aa376dc avformat: add demuxer for argonaut games' ASF format 
Adds support for the custom ASF container used by some Argonaut Games'
games, such as 'Croc! Legend of the Gobbos', and 'Croc 2'.

Can also handle the sample files in:
https://samples.ffmpeg.org/game-formats/brender/part2.zip

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
2020-01-26 10:24:00 +01:00

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/*
* Argonaut Games ASF demuxer
*
* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
*
* 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
*/
#include "avformat.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avassert.h"
#define ASF_TAG MKTAG('A', 'S', 'F', '\0')
#define ASF_FILE_HEADER_SIZE 24
#define ASF_CHUNK_HEADER_SIZE 20
typedef struct ArgoASFFileHeader {
uint32_t magic; /*< Magic Number, {'A', 'S', 'F', '\0'} */
uint16_t version_major; /*< File Major Version. */
uint16_t version_minor; /*< File Minor Version. */
uint32_t num_chunks; /*< No. chunks in the file. */
uint32_t chunk_offset; /*< Offset to the first chunk from the start of the file. */
int8_t name[8]; /*< Name. */
} ArgoASFFileHeader;
typedef struct ArgoASFChunkHeader {
uint32_t num_blocks; /*< No. blocks in the chunk. */
uint32_t num_samples; /*< No. samples per channel in a block. */
uint32_t unk1; /*< Unknown */
uint16_t sample_rate; /*< Sample rate. */
uint16_t unk2; /*< Unknown. */
uint32_t flags; /*< Stream flags. */
} ArgoASFChunkHeader;
enum {
ASF_CF_BITS_PER_SAMPLE = (1 << 0), /*< 16-bit if set, 8 otherwise. */
ASF_CF_STEREO = (1 << 1), /*< Stereo if set, mono otherwise. */
ASF_CF_ALWAYS1_1 = (1 << 2), /*< Unknown, always seems to be set. */
ASF_CF_ALWAYS1_2 = (1 << 3), /*< Unknown, always seems to be set. */
ASF_CF_ALWAYS1 = ASF_CF_ALWAYS1_1 | ASF_CF_ALWAYS1_2,
ASF_CF_ALWAYS0 = ~(ASF_CF_BITS_PER_SAMPLE | ASF_CF_STEREO | ASF_CF_ALWAYS1)
};
typedef struct ArgoASFDemuxContext {
ArgoASFFileHeader fhdr;
ArgoASFChunkHeader ckhdr;
uint32_t blocks_read;
} ArgoASFDemuxContext;
static void argo_asf_parse_file_header(ArgoASFFileHeader *hdr, const uint8_t *buf)
{
hdr->magic = AV_RL32(buf + 0);
hdr->version_major = AV_RL16(buf + 4);
hdr->version_minor = AV_RL16(buf + 6);
hdr->num_chunks = AV_RL32(buf + 8);
hdr->chunk_offset = AV_RL32(buf + 12);
for (int i = 0; i < FF_ARRAY_ELEMS(hdr->name); i++)
hdr->name[i] = AV_RL8(buf + 16 + i);
}
static void argo_asf_parse_chunk_header(ArgoASFChunkHeader *hdr, const uint8_t *buf)
{
hdr->num_blocks = AV_RL32(buf + 0);
hdr->num_samples = AV_RL32(buf + 4);
hdr->unk1 = AV_RL32(buf + 8);
hdr->sample_rate = AV_RL16(buf + 12);
hdr->unk2 = AV_RL16(buf + 14);
hdr->flags = AV_RL32(buf + 16);
}
/*
* Known versions:
* 1.1: The sample files in /game-formats/brender/part2.zip
* 1.2: Croc! Legend of the Gobbos
* 2.1: Croc 2
*/
static int argo_asf_is_known_version(const ArgoASFFileHeader *hdr)
{
return (hdr->version_major == 1 && hdr->version_minor == 1) ||
(hdr->version_major == 1 && hdr->version_minor == 2) ||
(hdr->version_major == 2 && hdr->version_minor == 1);
}
static int argo_asf_probe(const AVProbeData *p)
{
ArgoASFFileHeader hdr;
av_assert0(AVPROBE_PADDING_SIZE >= ASF_FILE_HEADER_SIZE);
argo_asf_parse_file_header(&hdr, p->buf);
if (hdr.magic != ASF_TAG)
return 0;
if (!argo_asf_is_known_version(&hdr))
return AVPROBE_SCORE_EXTENSION / 2;
return AVPROBE_SCORE_EXTENSION + 1;
}
static int argo_asf_read_header(AVFormatContext *s)
{
int64_t ret;
AVIOContext *pb = s->pb;
AVStream *st;
ArgoASFDemuxContext *asf = s->priv_data;
uint8_t buf[FFMAX(ASF_FILE_HEADER_SIZE, ASF_CHUNK_HEADER_SIZE)];
if (!(st = avformat_new_stream(s, NULL)))
return AVERROR(ENOMEM);
if ((ret = avio_read(pb, buf, ASF_FILE_HEADER_SIZE)) < 0)
return ret;
else if (ret != ASF_FILE_HEADER_SIZE)
return AVERROR(EIO);
argo_asf_parse_file_header(&asf->fhdr, buf);
if (!argo_asf_is_known_version(&asf->fhdr)) {
avpriv_request_sample(s, "Version %hu.%hu",
asf->fhdr.version_major, asf->fhdr.version_minor
);
return AVERROR_PATCHWELCOME;
}
if (asf->fhdr.num_chunks == 0) {
return AVERROR_INVALIDDATA;
} else if (asf->fhdr.num_chunks > 1) {
avpriv_request_sample(s, ">1 chunk");
return AVERROR_PATCHWELCOME;
}
if (asf->fhdr.chunk_offset < ASF_FILE_HEADER_SIZE)
return AVERROR_INVALIDDATA;
if ((ret = avio_skip(pb, asf->fhdr.chunk_offset - ASF_FILE_HEADER_SIZE)) < 0)
return ret;
if ((ret = avio_read(pb, buf, ASF_CHUNK_HEADER_SIZE)) < 0)
return ret;
else if (ret != ASF_CHUNK_HEADER_SIZE)
return AVERROR(EIO);
argo_asf_parse_chunk_header(&asf->ckhdr, buf);
if ((asf->ckhdr.flags & ASF_CF_ALWAYS1) != ASF_CF_ALWAYS1 || (asf->ckhdr.flags & ASF_CF_ALWAYS0) != 0) {
avpriv_request_sample(s, "Nonstandard flags (0x%08X)", asf->ckhdr.flags);
return AVERROR_PATCHWELCOME;
}
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_ARGO;
st->codecpar->format = AV_SAMPLE_FMT_S16P;
if (asf->ckhdr.flags & ASF_CF_STEREO) {
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
st->codecpar->channels = 2;
} else {
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
st->codecpar->channels = 1;
}
st->codecpar->sample_rate = asf->ckhdr.sample_rate;
st->codecpar->bits_per_coded_sample = 4;
if (asf->ckhdr.flags & ASF_CF_BITS_PER_SAMPLE)
st->codecpar->bits_per_raw_sample = 16;
else
st->codecpar->bits_per_raw_sample = 8;
if (st->codecpar->bits_per_raw_sample != 16) {
/* The header allows for these, but I've never seen any files with them. */
avpriv_request_sample(s, "Non 16-bit samples");
return AVERROR_PATCHWELCOME;
}
/*
* (nchannel control bytes) + ((bytes_per_channel) * nchannel)
* For mono, this is 17. For stereo, this is 34.
*/
st->codecpar->frame_size = st->codecpar->channels +
(asf->ckhdr.num_samples / 2) *
st->codecpar->channels;
st->codecpar->block_align = st->codecpar->frame_size;
st->codecpar->bit_rate = st->codecpar->channels *
st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
st->start_time = 0;
st->duration = asf->ckhdr.num_blocks * asf->ckhdr.num_samples;
st->nb_frames = asf->ckhdr.num_blocks;
return 0;
}
static int argo_asf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
ArgoASFDemuxContext *asf = s->priv_data;
AVStream *st = s->streams[0];
AVIOContext *pb = s->pb;
int ret;
if (asf->blocks_read >= asf->ckhdr.num_blocks)
return AVERROR_EOF;
if ((ret = av_get_packet(pb, pkt, st->codecpar->frame_size)) < 0)
return ret;
else if (ret != st->codecpar->frame_size)
return AVERROR_INVALIDDATA;
pkt->stream_index = st->index;
pkt->duration = asf->ckhdr.num_samples;
++asf->blocks_read;
return 0;
}
/*
* Not actually sure what ASF stands for.
* - Argonaut Sound File?
* - Audio Stream File?
*/
AVInputFormat ff_argo_asf_demuxer = {
.name = "argo_asf",
.long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
.priv_data_size = sizeof(ArgoASFDemuxContext),
.read_probe = argo_asf_probe,
.read_header = argo_asf_read_header,
.read_packet = argo_asf_read_packet
};
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