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"
26 #include "libavutil/opt.h"
28 #define ASF_TAG MKTAG('A', 'S', 'F', '\0')
29 #define ASF_FILE_HEADER_SIZE 24
30 #define ASF_CHUNK_HEADER_SIZE 20
31 #define ASF_SAMPLE_COUNT 32
33 typedef struct ArgoASFFileHeader {
34 uint32_t magic; /*< Magic Number, {'A', 'S', 'F', '\0'} */
35 uint16_t version_major; /*< File Major Version. */
36 uint16_t version_minor; /*< File Minor Version. */
37 uint32_t num_chunks; /*< No. chunks in the file. */
38 uint32_t chunk_offset; /*< Offset to the first chunk from the start of the file. */
39 int8_t name[8]; /*< Name. */
42 typedef struct ArgoASFChunkHeader {
43 uint32_t num_blocks; /*< No. blocks in the chunk. */
44 uint32_t num_samples; /*< No. samples per channel in a block. Always 32. */
45 uint32_t unk1; /*< Unknown */
46 uint16_t sample_rate; /*< Sample rate. */
47 uint16_t unk2; /*< Unknown. */
48 uint32_t flags; /*< Stream flags. */
52 ASF_CF_BITS_PER_SAMPLE = (1 << 0), /*< 16-bit if set, 8 otherwise. */
53 ASF_CF_STEREO = (1 << 1), /*< Stereo if set, mono otherwise. */
54 ASF_CF_ALWAYS1_1 = (1 << 2), /*< Unknown, always seems to be set. */
55 ASF_CF_ALWAYS1_2 = (1 << 3), /*< Unknown, always seems to be set. */
57 ASF_CF_ALWAYS1 = ASF_CF_ALWAYS1_1 | ASF_CF_ALWAYS1_2,
58 ASF_CF_ALWAYS0 = ~(ASF_CF_BITS_PER_SAMPLE | ASF_CF_STEREO | ASF_CF_ALWAYS1)
61 typedef struct ArgoASFDemuxContext {
62 ArgoASFFileHeader fhdr;
63 ArgoASFChunkHeader ckhdr;
65 } ArgoASFDemuxContext;
67 typedef struct ArgoASFMuxContext {
74 #if CONFIG_ARGO_ASF_DEMUXER
75 static void argo_asf_parse_file_header(ArgoASFFileHeader *hdr, const uint8_t *buf)
77 hdr->magic = AV_RL32(buf + 0);
78 hdr->version_major = AV_RL16(buf + 4);
79 hdr->version_minor = AV_RL16(buf + 6);
80 hdr->num_chunks = AV_RL32(buf + 8);
81 hdr->chunk_offset = AV_RL32(buf + 12);
82 for (int i = 0; i < FF_ARRAY_ELEMS(hdr->name); i++)
83 hdr->name[i] = AV_RL8(buf + 16 + i);
86 static void argo_asf_parse_chunk_header(ArgoASFChunkHeader *hdr, const uint8_t *buf)
88 hdr->num_blocks = AV_RL32(buf + 0);
89 hdr->num_samples = AV_RL32(buf + 4);
90 hdr->unk1 = AV_RL32(buf + 8);
91 hdr->sample_rate = AV_RL16(buf + 12);
92 hdr->unk2 = AV_RL16(buf + 14);
93 hdr->flags = AV_RL32(buf + 16);
98 * 1.1: https://samples.ffmpeg.org/game-formats/brender/part2.zip
100 * 1.2: Croc! Legend of the Gobbos
102 * The Emperor's New Groove
103 * Disney's Aladdin in Nasira's Revenge
105 static int argo_asf_is_known_version(const ArgoASFFileHeader *hdr)
107 return (hdr->version_major == 1 && hdr->version_minor == 1) ||
108 (hdr->version_major == 1 && hdr->version_minor == 2) ||
109 (hdr->version_major == 2 && hdr->version_minor == 1);
112 static int argo_asf_probe(const AVProbeData *p)
114 ArgoASFFileHeader hdr;
116 av_assert0(AVPROBE_PADDING_SIZE >= ASF_FILE_HEADER_SIZE);
118 argo_asf_parse_file_header(&hdr, p->buf);
120 if (hdr.magic != ASF_TAG)
123 if (!argo_asf_is_known_version(&hdr))
124 return AVPROBE_SCORE_EXTENSION / 2;
126 return AVPROBE_SCORE_EXTENSION + 1;
129 static int argo_asf_read_header(AVFormatContext *s)
132 AVIOContext *pb = s->pb;
134 ArgoASFDemuxContext *asf = s->priv_data;
135 uint8_t buf[FFMAX(ASF_FILE_HEADER_SIZE, ASF_CHUNK_HEADER_SIZE)];
137 if (!(st = avformat_new_stream(s, NULL)))
138 return AVERROR(ENOMEM);
140 if ((ret = avio_read(pb, buf, ASF_FILE_HEADER_SIZE)) < 0)
142 else if (ret != ASF_FILE_HEADER_SIZE)
145 argo_asf_parse_file_header(&asf->fhdr, buf);
147 if (asf->fhdr.num_chunks == 0) {
148 return AVERROR_INVALIDDATA;
149 } else if (asf->fhdr.num_chunks > 1) {
150 avpriv_request_sample(s, ">1 chunk");
151 return AVERROR_PATCHWELCOME;
154 if (asf->fhdr.chunk_offset < ASF_FILE_HEADER_SIZE)
155 return AVERROR_INVALIDDATA;
157 if ((ret = avio_skip(pb, asf->fhdr.chunk_offset - ASF_FILE_HEADER_SIZE)) < 0)
160 if ((ret = avio_read(pb, buf, ASF_CHUNK_HEADER_SIZE)) < 0)
162 else if (ret != ASF_CHUNK_HEADER_SIZE)
165 argo_asf_parse_chunk_header(&asf->ckhdr, buf);
167 if (asf->ckhdr.num_samples != ASF_SAMPLE_COUNT) {
168 av_log(s, AV_LOG_ERROR, "Invalid sample count. Got %u, expected %d\n",
169 asf->ckhdr.num_samples, ASF_SAMPLE_COUNT);
170 return AVERROR_INVALIDDATA;
173 if ((asf->ckhdr.flags & ASF_CF_ALWAYS1) != ASF_CF_ALWAYS1 || (asf->ckhdr.flags & ASF_CF_ALWAYS0) != 0) {
174 avpriv_request_sample(s, "Nonstandard flags (0x%08X)", asf->ckhdr.flags);
175 return AVERROR_PATCHWELCOME;
178 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
179 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_ARGO;
180 st->codecpar->format = AV_SAMPLE_FMT_S16P;
182 if (asf->ckhdr.flags & ASF_CF_STEREO) {
183 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
184 st->codecpar->channels = 2;
186 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
187 st->codecpar->channels = 1;
190 /* v1.1 files (FX Fighter) are all marked as 44100, but are actually 22050. */
191 if (asf->fhdr.version_major == 1 && asf->fhdr.version_minor == 1)
192 st->codecpar->sample_rate = 22050;
194 st->codecpar->sample_rate = asf->ckhdr.sample_rate;
196 st->codecpar->bits_per_coded_sample = 4;
198 if (asf->ckhdr.flags & ASF_CF_BITS_PER_SAMPLE)
199 st->codecpar->bits_per_raw_sample = 16;
201 st->codecpar->bits_per_raw_sample = 8;
203 if (st->codecpar->bits_per_raw_sample != 16) {
204 /* The header allows for these, but I've never seen any files with them. */
205 avpriv_request_sample(s, "Non 16-bit samples");
206 return AVERROR_PATCHWELCOME;
210 * (nchannel control bytes) + ((bytes_per_channel) * nchannel)
211 * For mono, this is 17. For stereo, this is 34.
213 st->codecpar->frame_size = st->codecpar->channels +
214 (asf->ckhdr.num_samples / 2) *
215 st->codecpar->channels;
217 st->codecpar->block_align = st->codecpar->frame_size;
219 st->codecpar->bit_rate = st->codecpar->channels *
220 st->codecpar->sample_rate *
221 st->codecpar->bits_per_coded_sample;
223 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
225 st->duration = asf->ckhdr.num_blocks * asf->ckhdr.num_samples;
226 st->nb_frames = asf->ckhdr.num_blocks;
230 static int argo_asf_read_packet(AVFormatContext *s, AVPacket *pkt)
232 ArgoASFDemuxContext *asf = s->priv_data;
234 AVStream *st = s->streams[0];
235 AVIOContext *pb = s->pb;
238 if (asf->blocks_read >= asf->ckhdr.num_blocks)
241 if ((ret = av_get_packet(pb, pkt, st->codecpar->frame_size)) < 0)
243 else if (ret != st->codecpar->frame_size)
244 return AVERROR_INVALIDDATA;
246 pkt->stream_index = st->index;
247 pkt->duration = asf->ckhdr.num_samples;
254 * Not actually sure what ASF stands for.
255 * - Argonaut Sound File?
256 * - Audio Stream File?
258 AVInputFormat ff_argo_asf_demuxer = {
260 .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
261 .priv_data_size = sizeof(ArgoASFDemuxContext),
262 .read_probe = argo_asf_probe,
263 .read_header = argo_asf_read_header,
264 .read_packet = argo_asf_read_packet
268 #if CONFIG_ARGO_ASF_MUXER
269 static int argo_asf_write_init(AVFormatContext *s)
271 ArgoASFMuxContext *ctx = s->priv_data;
272 const AVCodecParameters *par;
274 if (s->nb_streams != 1) {
275 av_log(s, AV_LOG_ERROR, "ASF files have exactly one stream\n");
276 return AVERROR(EINVAL);
279 par = s->streams[0]->codecpar;
281 if (par->codec_id != AV_CODEC_ID_ADPCM_ARGO) {
282 av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
283 avcodec_get_name(par->codec_id));
284 return AVERROR(EINVAL);
287 if (ctx->version_major == 1 && ctx->version_minor == 1 && par->sample_rate != 22050) {
288 av_log(s, AV_LOG_ERROR, "ASF v1.1 files only support a sample rate of 22050\n");
289 return AVERROR(EINVAL);
292 if (par->channels > 2) {
293 av_log(s, AV_LOG_ERROR, "ASF files only support up to 2 channels\n");
294 return AVERROR(EINVAL);
297 if (par->sample_rate > UINT16_MAX) {
298 av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
299 return AVERROR(EINVAL);
302 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
303 av_log(s, AV_LOG_ERROR, "Stream not seekable, unable to write output file\n");
304 return AVERROR(EINVAL);
310 static void argo_asf_write_file_header(const ArgoASFFileHeader *fhdr, AVIOContext *pb)
312 avio_wl32( pb, fhdr->magic);
313 avio_wl16( pb, fhdr->version_major);
314 avio_wl16( pb, fhdr->version_minor);
315 avio_wl32( pb, fhdr->num_chunks);
316 avio_wl32( pb, fhdr->chunk_offset);
317 avio_write(pb, fhdr->name, sizeof(fhdr->name));
320 static void argo_asf_write_chunk_header(const ArgoASFChunkHeader *ckhdr, AVIOContext *pb)
322 avio_wl32(pb, ckhdr->num_blocks);
323 avio_wl32(pb, ckhdr->num_samples);
324 avio_wl32(pb, ckhdr->unk1);
325 avio_wl16(pb, ckhdr->sample_rate);
326 avio_wl16(pb, ckhdr->unk2);
327 avio_wl32(pb, ckhdr->flags);
330 static int argo_asf_write_header(AVFormatContext *s)
332 const AVCodecParameters *par = s->streams[0]->codecpar;
333 ArgoASFMuxContext *ctx = s->priv_data;
334 ArgoASFFileHeader fhdr;
335 ArgoASFChunkHeader chdr;
337 fhdr.magic = ASF_TAG;
338 fhdr.version_major = (uint16_t)ctx->version_major;
339 fhdr.version_minor = (uint16_t)ctx->version_minor;
341 fhdr.chunk_offset = ASF_FILE_HEADER_SIZE;
343 * If the user specified a name, use it as is. Otherwise take the
344 * basename and lop off the extension (if any).
347 strncpy(fhdr.name, ctx->name, sizeof(fhdr.name));
349 const char *start = av_basename(s->url);
350 const char *end = strrchr(start, '.');
358 memcpy(fhdr.name, start, FFMIN(len, sizeof(fhdr.name)));
362 chdr.num_samples = ASF_SAMPLE_COUNT;
365 if (ctx->version_major == 1 && ctx->version_minor == 1)
366 chdr.sample_rate = 44100;
368 chdr.sample_rate = par->sample_rate;
371 chdr.flags = ASF_CF_BITS_PER_SAMPLE | ASF_CF_ALWAYS1;
373 if (par->channels == 2)
374 chdr.flags |= ASF_CF_STEREO;
376 argo_asf_write_file_header(&fhdr, s->pb);
377 argo_asf_write_chunk_header(&chdr, s->pb);
381 static int argo_asf_write_packet(AVFormatContext *s, AVPacket *pkt)
383 if (pkt->size != 17 * s->streams[0]->codecpar->channels)
384 return AVERROR_INVALIDDATA;
386 if (s->streams[0]->nb_frames >= UINT32_MAX)
387 return AVERROR_INVALIDDATA;
389 avio_write(s->pb, pkt->data, pkt->size);
393 static int argo_asf_write_trailer(AVFormatContext *s)
397 if ((ret = avio_seek(s->pb, ASF_FILE_HEADER_SIZE, SEEK_SET) < 0))
400 avio_wl32(s->pb, (uint32_t)s->streams[0]->nb_frames);
404 static const AVOption argo_asf_options[] = {
406 .name = "version_major",
407 .help = "override file major version",
408 .offset = offsetof(ArgoASFMuxContext, version_major),
409 .type = AV_OPT_TYPE_INT,
410 .default_val = {.i64 = 2},
413 .flags = AV_OPT_FLAG_ENCODING_PARAM
416 .name = "version_minor",
417 .help = "override file minor version",
418 .offset = offsetof(ArgoASFMuxContext, version_minor),
419 .type = AV_OPT_TYPE_INT,
420 .default_val = {.i64 = 1},
423 .flags = AV_OPT_FLAG_ENCODING_PARAM
427 .help = "embedded file name (max 8 characters)",
428 .offset = offsetof(ArgoASFMuxContext, name),
429 .type = AV_OPT_TYPE_STRING,
430 .default_val = {.str = NULL},
431 .flags = AV_OPT_FLAG_ENCODING_PARAM
436 static const AVClass argo_asf_muxer_class = {
437 .class_name = "argo_asf_muxer",
438 .item_name = av_default_item_name,
439 .option = argo_asf_options,
440 .version = LIBAVUTIL_VERSION_INT
443 AVOutputFormat ff_argo_asf_muxer = {
445 .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
447 * NB: Can't do this as it conflicts with the actual ASF format.
448 * .extensions = "asf",
450 .audio_codec = AV_CODEC_ID_ADPCM_ARGO,
451 .video_codec = AV_CODEC_ID_NONE,
452 .init = argo_asf_write_init,
453 .write_header = argo_asf_write_header,
454 .write_packet = argo_asf_write_packet,
455 .write_trailer = argo_asf_write_trailer,
456 .priv_class = &argo_asf_muxer_class,
457 .priv_data_size = sizeof(ArgoASFMuxContext)