2 * Argonaut Games ASF (de)muxer
4 * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/avassert.h"
27 #define ASF_TAG MKTAG('A', 'S', 'F', '\0')
28 #define ASF_FILE_HEADER_SIZE 24
29 #define ASF_CHUNK_HEADER_SIZE 20
30 #define ASF_SAMPLE_COUNT 32
32 typedef struct ArgoASFFileHeader {
33 uint32_t magic; /*< Magic Number, {'A', 'S', 'F', '\0'} */
34 uint16_t version_major; /*< File Major Version. */
35 uint16_t version_minor; /*< File Minor Version. */
36 uint32_t num_chunks; /*< No. chunks in the file. */
37 uint32_t chunk_offset; /*< Offset to the first chunk from the start of the file. */
38 int8_t name[8]; /*< Name. */
41 typedef struct ArgoASFChunkHeader {
42 uint32_t num_blocks; /*< No. blocks in the chunk. */
43 uint32_t num_samples; /*< No. samples per channel in a block. Always 32. */
44 uint32_t unk1; /*< Unknown */
45 uint16_t sample_rate; /*< Sample rate. */
46 uint16_t unk2; /*< Unknown. */
47 uint32_t flags; /*< Stream flags. */
51 ASF_CF_BITS_PER_SAMPLE = (1 << 0), /*< 16-bit if set, 8 otherwise. */
52 ASF_CF_STEREO = (1 << 1), /*< Stereo if set, mono otherwise. */
53 ASF_CF_ALWAYS1_1 = (1 << 2), /*< Unknown, always seems to be set. */
54 ASF_CF_ALWAYS1_2 = (1 << 3), /*< Unknown, always seems to be set. */
56 ASF_CF_ALWAYS1 = ASF_CF_ALWAYS1_1 | ASF_CF_ALWAYS1_2,
57 ASF_CF_ALWAYS0 = ~(ASF_CF_BITS_PER_SAMPLE | ASF_CF_STEREO | ASF_CF_ALWAYS1)
60 typedef struct ArgoASFDemuxContext {
61 ArgoASFFileHeader fhdr;
62 ArgoASFChunkHeader ckhdr;
64 } ArgoASFDemuxContext;
66 #if CONFIG_ARGO_ASF_DEMUXER
67 static void argo_asf_parse_file_header(ArgoASFFileHeader *hdr, const uint8_t *buf)
69 hdr->magic = AV_RL32(buf + 0);
70 hdr->version_major = AV_RL16(buf + 4);
71 hdr->version_minor = AV_RL16(buf + 6);
72 hdr->num_chunks = AV_RL32(buf + 8);
73 hdr->chunk_offset = AV_RL32(buf + 12);
74 for (int i = 0; i < FF_ARRAY_ELEMS(hdr->name); i++)
75 hdr->name[i] = AV_RL8(buf + 16 + i);
78 static void argo_asf_parse_chunk_header(ArgoASFChunkHeader *hdr, const uint8_t *buf)
80 hdr->num_blocks = AV_RL32(buf + 0);
81 hdr->num_samples = AV_RL32(buf + 4);
82 hdr->unk1 = AV_RL32(buf + 8);
83 hdr->sample_rate = AV_RL16(buf + 12);
84 hdr->unk2 = AV_RL16(buf + 14);
85 hdr->flags = AV_RL32(buf + 16);
90 * 1.1: The sample files in /game-formats/brender/part2.zip
91 * 1.2: Croc! Legend of the Gobbos
94 static int argo_asf_is_known_version(const ArgoASFFileHeader *hdr)
96 return (hdr->version_major == 1 && hdr->version_minor == 1) ||
97 (hdr->version_major == 1 && hdr->version_minor == 2) ||
98 (hdr->version_major == 2 && hdr->version_minor == 1);
101 static int argo_asf_probe(const AVProbeData *p)
103 ArgoASFFileHeader hdr;
105 av_assert0(AVPROBE_PADDING_SIZE >= ASF_FILE_HEADER_SIZE);
107 argo_asf_parse_file_header(&hdr, p->buf);
109 if (hdr.magic != ASF_TAG)
112 if (!argo_asf_is_known_version(&hdr))
113 return AVPROBE_SCORE_EXTENSION / 2;
115 return AVPROBE_SCORE_EXTENSION + 1;
118 static int argo_asf_read_header(AVFormatContext *s)
121 AVIOContext *pb = s->pb;
123 ArgoASFDemuxContext *asf = s->priv_data;
124 uint8_t buf[FFMAX(ASF_FILE_HEADER_SIZE, ASF_CHUNK_HEADER_SIZE)];
126 if (!(st = avformat_new_stream(s, NULL)))
127 return AVERROR(ENOMEM);
129 if ((ret = avio_read(pb, buf, ASF_FILE_HEADER_SIZE)) < 0)
131 else if (ret != ASF_FILE_HEADER_SIZE)
134 argo_asf_parse_file_header(&asf->fhdr, buf);
136 if (!argo_asf_is_known_version(&asf->fhdr)) {
137 avpriv_request_sample(s, "Version %hu.%hu",
138 asf->fhdr.version_major, asf->fhdr.version_minor
140 return AVERROR_PATCHWELCOME;
143 if (asf->fhdr.num_chunks == 0) {
144 return AVERROR_INVALIDDATA;
145 } else if (asf->fhdr.num_chunks > 1) {
146 avpriv_request_sample(s, ">1 chunk");
147 return AVERROR_PATCHWELCOME;
150 if (asf->fhdr.chunk_offset < ASF_FILE_HEADER_SIZE)
151 return AVERROR_INVALIDDATA;
153 if ((ret = avio_skip(pb, asf->fhdr.chunk_offset - ASF_FILE_HEADER_SIZE)) < 0)
156 if ((ret = avio_read(pb, buf, ASF_CHUNK_HEADER_SIZE)) < 0)
158 else if (ret != ASF_CHUNK_HEADER_SIZE)
161 argo_asf_parse_chunk_header(&asf->ckhdr, buf);
163 if (asf->ckhdr.num_samples != ASF_SAMPLE_COUNT) {
164 av_log(s, AV_LOG_ERROR, "Invalid sample count. Got %u, expected %d\n",
165 asf->ckhdr.num_samples, ASF_SAMPLE_COUNT);
166 return AVERROR_INVALIDDATA;
169 if ((asf->ckhdr.flags & ASF_CF_ALWAYS1) != ASF_CF_ALWAYS1 || (asf->ckhdr.flags & ASF_CF_ALWAYS0) != 0) {
170 avpriv_request_sample(s, "Nonstandard flags (0x%08X)", asf->ckhdr.flags);
171 return AVERROR_PATCHWELCOME;
174 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
175 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_ARGO;
176 st->codecpar->format = AV_SAMPLE_FMT_S16P;
178 if (asf->ckhdr.flags & ASF_CF_STEREO) {
179 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
180 st->codecpar->channels = 2;
182 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
183 st->codecpar->channels = 1;
186 st->codecpar->sample_rate = asf->ckhdr.sample_rate;
188 st->codecpar->bits_per_coded_sample = 4;
190 if (asf->ckhdr.flags & ASF_CF_BITS_PER_SAMPLE)
191 st->codecpar->bits_per_raw_sample = 16;
193 st->codecpar->bits_per_raw_sample = 8;
195 if (st->codecpar->bits_per_raw_sample != 16) {
196 /* The header allows for these, but I've never seen any files with them. */
197 avpriv_request_sample(s, "Non 16-bit samples");
198 return AVERROR_PATCHWELCOME;
202 * (nchannel control bytes) + ((bytes_per_channel) * nchannel)
203 * For mono, this is 17. For stereo, this is 34.
205 st->codecpar->frame_size = st->codecpar->channels +
206 (asf->ckhdr.num_samples / 2) *
207 st->codecpar->channels;
209 st->codecpar->block_align = st->codecpar->frame_size;
211 st->codecpar->bit_rate = st->codecpar->channels *
212 st->codecpar->sample_rate *
213 st->codecpar->bits_per_coded_sample;
215 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
217 st->duration = asf->ckhdr.num_blocks * asf->ckhdr.num_samples;
218 st->nb_frames = asf->ckhdr.num_blocks;
222 static int argo_asf_read_packet(AVFormatContext *s, AVPacket *pkt)
224 ArgoASFDemuxContext *asf = s->priv_data;
226 AVStream *st = s->streams[0];
227 AVIOContext *pb = s->pb;
230 if (asf->blocks_read >= asf->ckhdr.num_blocks)
233 if ((ret = av_get_packet(pb, pkt, st->codecpar->frame_size)) < 0)
235 else if (ret != st->codecpar->frame_size)
236 return AVERROR_INVALIDDATA;
238 pkt->stream_index = st->index;
239 pkt->duration = asf->ckhdr.num_samples;
246 * Not actually sure what ASF stands for.
247 * - Argonaut Sound File?
248 * - Audio Stream File?
250 AVInputFormat ff_argo_asf_demuxer = {
252 .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
253 .priv_data_size = sizeof(ArgoASFDemuxContext),
254 .read_probe = argo_asf_probe,
255 .read_header = argo_asf_read_header,
256 .read_packet = argo_asf_read_packet
260 #if CONFIG_ARGO_ASF_MUXER
261 static int argo_asf_write_init(AVFormatContext *s)
263 const AVCodecParameters *par;
265 if (s->nb_streams != 1) {
266 av_log(s, AV_LOG_ERROR, "ASF files have exactly one stream\n");
267 return AVERROR(EINVAL);
270 par = s->streams[0]->codecpar;
272 if (par->codec_id != AV_CODEC_ID_ADPCM_ARGO) {
273 av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
274 avcodec_get_name(par->codec_id));
275 return AVERROR(EINVAL);
278 if (par->channels > 2) {
279 av_log(s, AV_LOG_ERROR, "ASF files only support up to 2 channels\n");
280 return AVERROR(EINVAL);
283 if (par->sample_rate > UINT16_MAX) {
284 av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
285 return AVERROR(EINVAL);
288 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
289 av_log(s, AV_LOG_ERROR, "Stream not seekable, unable to write output file\n");
290 return AVERROR(EINVAL);
296 static void argo_asf_write_file_header(const ArgoASFFileHeader *fhdr, AVIOContext *pb)
298 avio_wl32( pb, fhdr->magic);
299 avio_wl16( pb, fhdr->version_major);
300 avio_wl16( pb, fhdr->version_minor);
301 avio_wl32( pb, fhdr->num_chunks);
302 avio_wl32( pb, fhdr->chunk_offset);
303 avio_write(pb, fhdr->name, sizeof(fhdr->name));
306 static void argo_asf_write_chunk_header(const ArgoASFChunkHeader *ckhdr, AVIOContext *pb)
308 avio_wl32(pb, ckhdr->num_blocks);
309 avio_wl32(pb, ckhdr->num_samples);
310 avio_wl32(pb, ckhdr->unk1);
311 avio_wl16(pb, ckhdr->sample_rate);
312 avio_wl16(pb, ckhdr->unk2);
313 avio_wl32(pb, ckhdr->flags);
316 static int argo_asf_write_header(AVFormatContext *s)
318 const AVCodecParameters *par = s->streams[0]->codecpar;
319 ArgoASFFileHeader fhdr;
320 ArgoASFChunkHeader chdr;
322 fhdr.magic = ASF_TAG;
323 fhdr.version_major = 2;
324 fhdr.version_minor = 1;
326 fhdr.chunk_offset = ASF_FILE_HEADER_SIZE;
327 strncpy(fhdr.name, av_basename(s->url), FF_ARRAY_ELEMS(fhdr.name));
330 chdr.num_samples = ASF_SAMPLE_COUNT;
332 chdr.sample_rate = par->sample_rate;
334 chdr.flags = ASF_CF_BITS_PER_SAMPLE | ASF_CF_ALWAYS1;
336 if (par->channels == 2)
337 chdr.flags |= ASF_CF_STEREO;
339 argo_asf_write_file_header(&fhdr, s->pb);
340 argo_asf_write_chunk_header(&chdr, s->pb);
344 static int argo_asf_write_packet(AVFormatContext *s, AVPacket *pkt)
346 if (pkt->size != 17 * s->streams[0]->codecpar->channels)
347 return AVERROR_INVALIDDATA;
349 if (s->streams[0]->nb_frames >= UINT32_MAX)
350 return AVERROR_INVALIDDATA;
352 avio_write(s->pb, pkt->data, pkt->size);
356 static int argo_asf_write_trailer(AVFormatContext *s)
360 if ((ret = avio_seek(s->pb, ASF_FILE_HEADER_SIZE, SEEK_SET) < 0))
363 avio_wl32(s->pb, (uint32_t)s->streams[0]->nb_frames);
367 AVOutputFormat ff_argo_asf_muxer = {
369 .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
371 * NB: Can't do this as it conflicts with the actual ASF format.
372 * .extensions = "asf",
374 .audio_codec = AV_CODEC_ID_ADPCM_ARGO,
375 .video_codec = AV_CODEC_ID_NONE,
376 .init = argo_asf_write_init,
377 .write_header = argo_asf_write_header,
378 .write_packet = argo_asf_write_packet,
379 .write_trailer = argo_asf_write_trailer