| /* |
| * 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 "avformat.h" |
| #include "internal.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); |
| for (int i = 0; i < FF_ARRAY_ELEMS(hdr->name); i++) |
| hdr->name[i] = AV_RL8(buf + 16 + i); |
| } |
| |
| 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->channel_layout = AV_CH_LAYOUT_STEREO; |
| st->codecpar->channels = 2; |
| } else { |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codecpar->channels = 1; |
| } |
| |
| /* 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) |
| 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->block_align = st->codecpar->channels + |
| (ckhdr->num_samples / 2) * |
| st->codecpar->channels; |
| |
| 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; |
| |
| 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); |
| |
| 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? |
| */ |
| 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, |
| .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; |
| |
| if (s->nb_streams != 1) { |
| av_log(s, AV_LOG_ERROR, "ASF files have exactly one stream\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| par = s->streams[0]->codecpar; |
| |
| if (par->codec_id != AV_CODEC_ID_ADPCM_ARGO) { |
| av_log(s, AV_LOG_ERROR, "%s codec not supported\n", |
| avcodec_get_name(par->codec_id)); |
| return AVERROR(EINVAL); |
| } |
| |
| 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->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->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, sizeof(fhdr->name)); |
| } |
| |
| 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 |
| }; |
| |
| /* |
| * If the user specified a name, use it as is. Otherwise take the |
| * basename and lop off the extension (if any). |
| */ |
| if (ctx->name) { |
| strncpy(fhdr.name, ctx->name, sizeof(fhdr.name)); |
| } else { |
| const char *start = av_basename(s->url); |
| const char *end = strrchr(start, '.'); |
| size_t len; |
| |
| if (end) |
| len = end - start; |
| else |
| len = strlen(start); |
| |
| memcpy(fhdr.name, start, FFMIN(len, sizeof(fhdr.name))); |
| } |
| |
| 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->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 |
| }; |
| |
| AVOutputFormat ff_argo_asf_muxer = { |
| .name = "argo_asf", |
| .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"), |
| /* |
| * NB: Can't do this as it conflicts with the actual ASF format. |
| * .extensions = "asf", |
| */ |
| .audio_codec = AV_CODEC_ID_ADPCM_ARGO, |
| .video_codec = AV_CODEC_ID_NONE, |
| .init = argo_asf_write_init, |
| .write_header = argo_asf_write_header, |
| .write_packet = argo_asf_write_packet, |
| .write_trailer = argo_asf_write_trailer, |
| .priv_class = &argo_asf_muxer_class, |
| .priv_data_size = sizeof(ArgoASFMuxContext) |
| }; |
| #endif |
