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