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ffmpeg/libavformat/argo_asf.c

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/*
* Argonaut Games ASF (de)muxer
*
* 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 "config_components.h"
#include "libavutil/avstring.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "mux.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "argo_asf.h"
/* Maximum number of blocks to read at once. */
#define ASF_NB_BLOCKS 32
typedef struct ArgoASFDemuxContext {
ArgoASFFileHeader fhdr;
ArgoASFChunkHeader ckhdr;
uint32_t blocks_read;
} ArgoASFDemuxContext;
typedef struct ArgoASFMuxContext {
const AVClass *class;
int version_major;
int version_minor;
const char *name;
int64_t nb_blocks;
} ArgoASFMuxContext;
void ff_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);
memcpy(hdr->name, buf + 16, ASF_NAME_SIZE);
hdr->name[ASF_NAME_SIZE] = '\0';
}
int ff_argo_asf_validate_file_header(AVFormatContext *s, const ArgoASFFileHeader *hdr)
{
if (hdr->magic != ASF_TAG || hdr->num_chunks == 0)
return AVERROR_INVALIDDATA;
if (hdr->chunk_offset < ASF_FILE_HEADER_SIZE)
return AVERROR_INVALIDDATA;
return 0;
}
void ff_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);
}
int ff_argo_asf_fill_stream(AVFormatContext *s, AVStream *st, const ArgoASFFileHeader *fhdr,
const ArgoASFChunkHeader *ckhdr)
{
if (ckhdr->num_samples != ASF_SAMPLE_COUNT) {
av_log(s, AV_LOG_ERROR, "Invalid sample count. Got %u, expected %d\n",
ckhdr->num_samples, ASF_SAMPLE_COUNT);
return AVERROR_INVALIDDATA;
}
if ((ckhdr->flags & ASF_CF_ALWAYS1) != ASF_CF_ALWAYS1 || (ckhdr->flags & ASF_CF_ALWAYS0) != 0) {
avpriv_request_sample(s, "Nonstandard flags (0x%08X)", 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 (ckhdr->flags & ASF_CF_STEREO) {
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
} else {
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
}
/* v1.1 files (FX Fighter) are all marked as 44100, but are actually 22050. */
if (fhdr->version_major == 1 && fhdr->version_minor == 1)
st->codecpar->sample_rate = 22050;
else
st->codecpar->sample_rate = ckhdr->sample_rate;
st->codecpar->bits_per_coded_sample = 4;
if (!(ckhdr->flags & ASF_CF_BITS_PER_SAMPLE)) {
/* 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->block_align = st->codecpar->ch_layout.nb_channels +
(ckhdr->num_samples / 2) *
st->codecpar->ch_layout.nb_channels;
st->codecpar->bit_rate = st->codecpar->ch_layout.nb_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;
if (fhdr->num_chunks == 1) {
st->duration = ckhdr->num_blocks * ckhdr->num_samples;
st->nb_frames = ckhdr->num_blocks;
}
return 0;
}
#if CONFIG_ARGO_ASF_DEMUXER
/*
* Known versions:
* 1.1: https://samples.ffmpeg.org/game-formats/brender/part2.zip
* FX Fighter
* 1.2: Croc! Legend of the Gobbos
* 2.1: Croc 2
* The Emperor's New Groove
* Disney's Aladdin in Nasira's Revenge
*/
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);
ff_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[ASF_MIN_BUFFER_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);
ff_argo_asf_parse_file_header(&asf->fhdr, buf);
if ((ret = ff_argo_asf_validate_file_header(s, &asf->fhdr)) < 0)
return ret;
/* This should only be 1 in ASF files. >1 is fine if in BRP. */
if (asf->fhdr.num_chunks != 1)
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);
ff_argo_asf_parse_chunk_header(&asf->ckhdr, buf);
av_dict_set(&s->metadata, "title", asf->fhdr.name, 0);
return ff_argo_asf_fill_stream(s, st, &asf->fhdr, &asf->ckhdr);
}
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;
ret = av_get_packet(pb, pkt, st->codecpar->block_align *
FFMIN(ASF_NB_BLOCKS, asf->ckhdr.num_blocks - asf->blocks_read));
if (ret < 0)
return ret;
/* Something real screwy is going on. */
if (ret % st->codecpar->block_align != 0)
return AVERROR_INVALIDDATA;
pkt->stream_index = st->index;
pkt->duration = asf->ckhdr.num_samples * (ret / st->codecpar->block_align);
pkt->pts = asf->blocks_read * asf->ckhdr.num_samples;
asf->blocks_read += (ret / st->codecpar->block_align);
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
return 0;
}
static int argo_asf_seek(AVFormatContext *s, int stream_index,
int64_t pts, int flags)
{
ArgoASFDemuxContext *asf = s->priv_data;
AVStream *st = s->streams[stream_index];
int64_t offset;
uint32_t block = pts / asf->ckhdr.num_samples;
if (block >= asf->ckhdr.num_blocks)
return -1;
offset = asf->fhdr.chunk_offset + ASF_CHUNK_HEADER_SIZE +
(block * st->codecpar->block_align);
if ((offset = avio_seek(s->pb, offset, SEEK_SET)) < 0)
return offset;
asf->blocks_read = block;
return 0;
}
/*
* Not actually sure what ASF stands for.
* - Argonaut Sound File?
* - Audio Stream File?
*/
const FFInputFormat ff_argo_asf_demuxer = {
.p.name = "argo_asf",
.p.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,
.read_seek = argo_asf_seek,
};
#endif
#if CONFIG_ARGO_ASF_MUXER
static int argo_asf_write_init(AVFormatContext *s)
{
ArgoASFMuxContext *ctx = s->priv_data;
const AVCodecParameters *par = s->streams[0]->codecpar;
if (ctx->version_major == 1 && ctx->version_minor == 1 && par->sample_rate != 22050) {
av_log(s, AV_LOG_ERROR, "ASF v1.1 files only support a sample rate of 22050\n");
return AVERROR(EINVAL);
}
if (par->ch_layout.nb_channels > 2) {
av_log(s, AV_LOG_ERROR, "ASF files only support up to 2 channels\n");
return AVERROR(EINVAL);
}
if (par->block_align != 17 * par->ch_layout.nb_channels)
return AVERROR(EINVAL);
if (par->sample_rate > UINT16_MAX) {
av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
return AVERROR(EINVAL);
}
if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(s, AV_LOG_ERROR, "Stream not seekable, unable to write output file\n");
return AVERROR(EINVAL);
}
return 0;
}
static void argo_asf_write_file_header(const ArgoASFFileHeader *fhdr, AVIOContext *pb)
{
avio_wl32( pb, fhdr->magic);
avio_wl16( pb, fhdr->version_major);
avio_wl16( pb, fhdr->version_minor);
avio_wl32( pb, fhdr->num_chunks);
avio_wl32( pb, fhdr->chunk_offset);
avio_write(pb, fhdr->name, ASF_NAME_SIZE);
}
static void argo_asf_write_chunk_header(const ArgoASFChunkHeader *ckhdr, AVIOContext *pb)
{
avio_wl32(pb, ckhdr->num_blocks);
avio_wl32(pb, ckhdr->num_samples);
avio_wl32(pb, ckhdr->unk1);
avio_wl16(pb, ckhdr->sample_rate);
avio_wl16(pb, ckhdr->unk2);
avio_wl32(pb, ckhdr->flags);
}
static int argo_asf_write_header(AVFormatContext *s)
{
const AVCodecParameters *par = s->streams[0]->codecpar;
ArgoASFMuxContext *ctx = s->priv_data;
ArgoASFChunkHeader chdr;
ArgoASFFileHeader fhdr = {
.magic = ASF_TAG,
.version_major = (uint16_t)ctx->version_major,
.version_minor = (uint16_t)ctx->version_minor,
.num_chunks = 1,
.chunk_offset = ASF_FILE_HEADER_SIZE
};
AVDictionaryEntry *t;
const char *name, *end;
size_t len;
/*
* If the user specified a name, use it as is. Otherwise,
* try to use metadata (if present), then fall back to the
* filename (minus extension).
*/
if (ctx->name) {
name = ctx->name;
len = strlen(ctx->name);
} else if ((t = av_dict_get(s->metadata, "title", NULL, 0))) {
name = t->value;
len = strlen(t->value);
} else if (!(end = strrchr((name = av_basename(s->url)), '.'))) {
len = strlen(name);
} else {
len = end - name;
}
memcpy(fhdr.name, name, FFMIN(len, ASF_NAME_SIZE));
chdr.num_blocks = 0;
chdr.num_samples = ASF_SAMPLE_COUNT;
chdr.unk1 = 0;
if (ctx->version_major == 1 && ctx->version_minor == 1)
chdr.sample_rate = 44100;
else
chdr.sample_rate = par->sample_rate;
chdr.unk2 = ~0;
chdr.flags = ASF_CF_BITS_PER_SAMPLE | ASF_CF_ALWAYS1;
if (par->ch_layout.nb_channels == 2)
chdr.flags |= ASF_CF_STEREO;
argo_asf_write_file_header(&fhdr, s->pb);
argo_asf_write_chunk_header(&chdr, s->pb);
return 0;
}
static int argo_asf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ArgoASFMuxContext *ctx = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
int nb_blocks = pkt->size / par->block_align;
if (pkt->size % par->block_align != 0)
return AVERROR_INVALIDDATA;
if (ctx->nb_blocks + nb_blocks > UINT32_MAX)
return AVERROR_INVALIDDATA;
avio_write(s->pb, pkt->data, pkt->size);
ctx->nb_blocks += nb_blocks;
return 0;
}
static int argo_asf_write_trailer(AVFormatContext *s)
{
ArgoASFMuxContext *ctx = s->priv_data;
int64_t ret;
if ((ret = avio_seek(s->pb, ASF_FILE_HEADER_SIZE, SEEK_SET)) < 0)
return ret;
avio_wl32(s->pb, (uint32_t)ctx->nb_blocks);
return 0;
}
static const AVOption argo_asf_options[] = {
{
.name = "version_major",
.help = "override file major version",
.offset = offsetof(ArgoASFMuxContext, version_major),
.type = AV_OPT_TYPE_INT,
.default_val = {.i64 = 2},
.min = 0,
.max = UINT16_MAX,
.flags = AV_OPT_FLAG_ENCODING_PARAM
},
{
.name = "version_minor",
.help = "override file minor version",
.offset = offsetof(ArgoASFMuxContext, version_minor),
.type = AV_OPT_TYPE_INT,
.default_val = {.i64 = 1},
.min = 0,
.max = UINT16_MAX,
.flags = AV_OPT_FLAG_ENCODING_PARAM
},
{
.name = "name",
.help = "embedded file name (max 8 characters)",
.offset = offsetof(ArgoASFMuxContext, name),
.type = AV_OPT_TYPE_STRING,
.default_val = {.str = NULL},
.flags = AV_OPT_FLAG_ENCODING_PARAM
},
{ NULL }
};
static const AVClass argo_asf_muxer_class = {
.class_name = "argo_asf_muxer",
.item_name = av_default_item_name,
.option = argo_asf_options,
.version = LIBAVUTIL_VERSION_INT
};
const FFOutputFormat ff_argo_asf_muxer = {
.p.name = "argo_asf",
.p.long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
/*
* NB: Can't do this as it conflicts with the actual ASF format.
* .p.extensions = "asf",
*/
.p.audio_codec = AV_CODEC_ID_ADPCM_ARGO,
.p.video_codec = AV_CODEC_ID_NONE,
.p.subtitle_codec = AV_CODEC_ID_NONE,
.p.priv_class = &argo_asf_muxer_class,
.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
.init = argo_asf_write_init,
.write_header = argo_asf_write_header,
.write_packet = argo_asf_write_packet,
.write_trailer = argo_asf_write_trailer,
.priv_data_size = sizeof(ArgoASFMuxContext)
};
#endif
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