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 {
73 #if CONFIG_ARGO_ASF_DEMUXER
74 static void argo_asf_parse_file_header(ArgoASFFileHeader *hdr, const uint8_t *buf)
76 hdr->magic = AV_RL32(buf + 0);
77 hdr->version_major = AV_RL16(buf + 4);
78 hdr->version_minor = AV_RL16(buf + 6);
79 hdr->num_chunks = AV_RL32(buf + 8);
80 hdr->chunk_offset = AV_RL32(buf + 12);
81 for (int i = 0; i < FF_ARRAY_ELEMS(hdr->name); i++)
82 hdr->name[i] = AV_RL8(buf + 16 + i);
85 static void argo_asf_parse_chunk_header(ArgoASFChunkHeader *hdr, const uint8_t *buf)
87 hdr->num_blocks = AV_RL32(buf + 0);
88 hdr->num_samples = AV_RL32(buf + 4);
89 hdr->unk1 = AV_RL32(buf + 8);
90 hdr->sample_rate = AV_RL16(buf + 12);
91 hdr->unk2 = AV_RL16(buf + 14);
92 hdr->flags = AV_RL32(buf + 16);
97 * 1.1: https://samples.ffmpeg.org/game-formats/brender/part2.zip
99 * 1.2: Croc! Legend of the Gobbos
101 * The Emperor's New Groove
102 * Disney's Aladdin in Nasira's Revenge
104 static int argo_asf_is_known_version(const ArgoASFFileHeader *hdr)
106 return (hdr->version_major == 1 && hdr->version_minor == 1) ||
107 (hdr->version_major == 1 && hdr->version_minor == 2) ||
108 (hdr->version_major == 2 && hdr->version_minor == 1);
111 static int argo_asf_probe(const AVProbeData *p)
113 ArgoASFFileHeader hdr;
115 av_assert0(AVPROBE_PADDING_SIZE >= ASF_FILE_HEADER_SIZE);
117 argo_asf_parse_file_header(&hdr, p->buf);
119 if (hdr.magic != ASF_TAG)
122 if (!argo_asf_is_known_version(&hdr))
123 return AVPROBE_SCORE_EXTENSION / 2;
125 return AVPROBE_SCORE_EXTENSION + 1;
128 static int argo_asf_read_header(AVFormatContext *s)
131 AVIOContext *pb = s->pb;
133 ArgoASFDemuxContext *asf = s->priv_data;
134 uint8_t buf[FFMAX(ASF_FILE_HEADER_SIZE, ASF_CHUNK_HEADER_SIZE)];
136 if (!(st = avformat_new_stream(s, NULL)))
137 return AVERROR(ENOMEM);
139 if ((ret = avio_read(pb, buf, ASF_FILE_HEADER_SIZE)) < 0)
141 else if (ret != ASF_FILE_HEADER_SIZE)
144 argo_asf_parse_file_header(&asf->fhdr, buf);
146 if (asf->fhdr.num_chunks == 0) {
147 return AVERROR_INVALIDDATA;
148 } else if (asf->fhdr.num_chunks > 1) {
149 avpriv_request_sample(s, ">1 chunk");
150 return AVERROR_PATCHWELCOME;
153 if (asf->fhdr.chunk_offset < ASF_FILE_HEADER_SIZE)
154 return AVERROR_INVALIDDATA;
156 if ((ret = avio_skip(pb, asf->fhdr.chunk_offset - ASF_FILE_HEADER_SIZE)) < 0)
159 if ((ret = avio_read(pb, buf, ASF_CHUNK_HEADER_SIZE)) < 0)
161 else if (ret != ASF_CHUNK_HEADER_SIZE)
164 argo_asf_parse_chunk_header(&asf->ckhdr, buf);
166 if (asf->ckhdr.num_samples != ASF_SAMPLE_COUNT) {
167 av_log(s, AV_LOG_ERROR, "Invalid sample count. Got %u, expected %d\n",
168 asf->ckhdr.num_samples, ASF_SAMPLE_COUNT);
169 return AVERROR_INVALIDDATA;
172 if ((asf->ckhdr.flags & ASF_CF_ALWAYS1) != ASF_CF_ALWAYS1 || (asf->ckhdr.flags & ASF_CF_ALWAYS0) != 0) {
173 avpriv_request_sample(s, "Nonstandard flags (0x%08X)", asf->ckhdr.flags);
174 return AVERROR_PATCHWELCOME;
177 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
178 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_ARGO;
179 st->codecpar->format = AV_SAMPLE_FMT_S16P;
181 if (asf->ckhdr.flags & ASF_CF_STEREO) {
182 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
183 st->codecpar->channels = 2;
185 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
186 st->codecpar->channels = 1;
189 st->codecpar->sample_rate = asf->ckhdr.sample_rate;
191 st->codecpar->bits_per_coded_sample = 4;
193 if (asf->ckhdr.flags & ASF_CF_BITS_PER_SAMPLE)
194 st->codecpar->bits_per_raw_sample = 16;
196 st->codecpar->bits_per_raw_sample = 8;
198 if (st->codecpar->bits_per_raw_sample != 16) {
199 /* The header allows for these, but I've never seen any files with them. */
200 avpriv_request_sample(s, "Non 16-bit samples");
201 return AVERROR_PATCHWELCOME;
205 * (nchannel control bytes) + ((bytes_per_channel) * nchannel)
206 * For mono, this is 17. For stereo, this is 34.
208 st->codecpar->frame_size = st->codecpar->channels +
209 (asf->ckhdr.num_samples / 2) *
210 st->codecpar->channels;
212 st->codecpar->block_align = st->codecpar->frame_size;
214 st->codecpar->bit_rate = st->codecpar->channels *
215 st->codecpar->sample_rate *
216 st->codecpar->bits_per_coded_sample;
218 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
220 st->duration = asf->ckhdr.num_blocks * asf->ckhdr.num_samples;
221 st->nb_frames = asf->ckhdr.num_blocks;
225 static int argo_asf_read_packet(AVFormatContext *s, AVPacket *pkt)
227 ArgoASFDemuxContext *asf = s->priv_data;
229 AVStream *st = s->streams[0];
230 AVIOContext *pb = s->pb;
233 if (asf->blocks_read >= asf->ckhdr.num_blocks)
236 if ((ret = av_get_packet(pb, pkt, st->codecpar->frame_size)) < 0)
238 else if (ret != st->codecpar->frame_size)
239 return AVERROR_INVALIDDATA;
241 pkt->stream_index = st->index;
242 pkt->duration = asf->ckhdr.num_samples;
249 * Not actually sure what ASF stands for.
250 * - Argonaut Sound File?
251 * - Audio Stream File?
253 AVInputFormat ff_argo_asf_demuxer = {
255 .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
256 .priv_data_size = sizeof(ArgoASFDemuxContext),
257 .read_probe = argo_asf_probe,
258 .read_header = argo_asf_read_header,
259 .read_packet = argo_asf_read_packet
263 #if CONFIG_ARGO_ASF_MUXER
264 static int argo_asf_write_init(AVFormatContext *s)
266 const AVCodecParameters *par;
268 if (s->nb_streams != 1) {
269 av_log(s, AV_LOG_ERROR, "ASF files have exactly one stream\n");
270 return AVERROR(EINVAL);
273 par = s->streams[0]->codecpar;
275 if (par->codec_id != AV_CODEC_ID_ADPCM_ARGO) {
276 av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
277 avcodec_get_name(par->codec_id));
278 return AVERROR(EINVAL);
281 if (par->channels > 2) {
282 av_log(s, AV_LOG_ERROR, "ASF files only support up to 2 channels\n");
283 return AVERROR(EINVAL);
286 if (par->sample_rate > UINT16_MAX) {
287 av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
288 return AVERROR(EINVAL);
291 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
292 av_log(s, AV_LOG_ERROR, "Stream not seekable, unable to write output file\n");
293 return AVERROR(EINVAL);
299 static void argo_asf_write_file_header(const ArgoASFFileHeader *fhdr, AVIOContext *pb)
301 avio_wl32( pb, fhdr->magic);
302 avio_wl16( pb, fhdr->version_major);
303 avio_wl16( pb, fhdr->version_minor);
304 avio_wl32( pb, fhdr->num_chunks);
305 avio_wl32( pb, fhdr->chunk_offset);
306 avio_write(pb, fhdr->name, sizeof(fhdr->name));
309 static void argo_asf_write_chunk_header(const ArgoASFChunkHeader *ckhdr, AVIOContext *pb)
311 avio_wl32(pb, ckhdr->num_blocks);
312 avio_wl32(pb, ckhdr->num_samples);
313 avio_wl32(pb, ckhdr->unk1);
314 avio_wl16(pb, ckhdr->sample_rate);
315 avio_wl16(pb, ckhdr->unk2);
316 avio_wl32(pb, ckhdr->flags);
319 static int argo_asf_write_header(AVFormatContext *s)
321 const AVCodecParameters *par = s->streams[0]->codecpar;
322 ArgoASFMuxContext *ctx = s->priv_data;
323 ArgoASFFileHeader fhdr;
324 ArgoASFChunkHeader chdr;
326 fhdr.magic = ASF_TAG;
327 fhdr.version_major = (uint16_t)ctx->version_major;
328 fhdr.version_minor = (uint16_t)ctx->version_minor;
330 fhdr.chunk_offset = ASF_FILE_HEADER_SIZE;
331 strncpy(fhdr.name, av_basename(s->url), FF_ARRAY_ELEMS(fhdr.name));
334 chdr.num_samples = ASF_SAMPLE_COUNT;
336 chdr.sample_rate = par->sample_rate;
338 chdr.flags = ASF_CF_BITS_PER_SAMPLE | ASF_CF_ALWAYS1;
340 if (par->channels == 2)
341 chdr.flags |= ASF_CF_STEREO;
343 argo_asf_write_file_header(&fhdr, s->pb);
344 argo_asf_write_chunk_header(&chdr, s->pb);
348 static int argo_asf_write_packet(AVFormatContext *s, AVPacket *pkt)
350 if (pkt->size != 17 * s->streams[0]->codecpar->channels)
351 return AVERROR_INVALIDDATA;
353 if (s->streams[0]->nb_frames >= UINT32_MAX)
354 return AVERROR_INVALIDDATA;
356 avio_write(s->pb, pkt->data, pkt->size);
360 static int argo_asf_write_trailer(AVFormatContext *s)
364 if ((ret = avio_seek(s->pb, ASF_FILE_HEADER_SIZE, SEEK_SET) < 0))
367 avio_wl32(s->pb, (uint32_t)s->streams[0]->nb_frames);
371 static const AVOption argo_asf_options[] = {
373 .name = "version_major",
374 .help = "override file major version",
375 .offset = offsetof(ArgoASFMuxContext, version_major),
376 .type = AV_OPT_TYPE_INT,
377 .default_val = {.i64 = 2},
380 .flags = AV_OPT_FLAG_ENCODING_PARAM
383 .name = "version_minor",
384 .help = "override file minor version",
385 .offset = offsetof(ArgoASFMuxContext, version_minor),
386 .type = AV_OPT_TYPE_INT,
387 .default_val = {.i64 = 1},
390 .flags = AV_OPT_FLAG_ENCODING_PARAM
395 static const AVClass argo_asf_muxer_class = {
396 .class_name = "argo_asf_muxer",
397 .item_name = av_default_item_name,
398 .option = argo_asf_options,
399 .version = LIBAVUTIL_VERSION_INT
402 AVOutputFormat ff_argo_asf_muxer = {
404 .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games ASF"),
406 * NB: Can't do this as it conflicts with the actual ASF format.
407 * .extensions = "asf",
409 .audio_codec = AV_CODEC_ID_ADPCM_ARGO,
410 .video_codec = AV_CODEC_ID_NONE,
411 .init = argo_asf_write_init,
412 .write_header = argo_asf_write_header,
413 .write_packet = argo_asf_write_packet,
414 .write_trailer = argo_asf_write_trailer,
415 .priv_class = &argo_asf_muxer_class,
416 .priv_data_size = sizeof(ArgoASFMuxContext)