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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
#define ASF_SAMPLE_COUNT 32
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. Always 32. */
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.num_samples != ASF_SAMPLE_COUNT) {
av_log(s, AV_LOG_ERROR, "Invalid sample count. Got %u, expected %d\n",
asf->ckhdr.num_samples, ASF_SAMPLE_COUNT);
return AVERROR_INVALIDDATA;
}
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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