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1/*
2 * Microsoft XMV demuxer
3 * Copyright (c) 2011 Sven Hesse <drmccoy@drmccoy.de>
4 * Copyright (c) 2011 Matthew Hoops <clone2727@gmail.com>
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
23/**
24 * @file
25 * Microsoft XMV demuxer
26 */
27
28#include <inttypes.h>
29
30#include "libavutil/intreadwrite.h"
31
32#include "avformat.h"
33#include "internal.h"
34#include "riff.h"
35#include "libavutil/avassert.h"
36
37/** The min size of an XMV header. */
38#define XMV_MIN_HEADER_SIZE 36
39
40/** Audio flag: ADPCM'd 5.1 stream, front left / right channels */
41#define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1
42/** Audio flag: ADPCM'd 5.1 stream, front center / low frequency channels */
43#define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2
44/** Audio flag: ADPCM'd 5.1 stream, rear left / right channels */
45#define XMV_AUDIO_ADPCM51_REARLEFTRIGHT 4
46
47/** Audio flag: Any of the ADPCM'd 5.1 stream flags. */
48#define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \
49 XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \
50 XMV_AUDIO_ADPCM51_REARLEFTRIGHT)
51
52#define XMV_BLOCK_ALIGN_SIZE 36
53
54/** A video packet with an XMV file. */
55typedef struct XMVVideoPacket {
56 int created;
57 int stream_index; ///< The decoder stream index for this video packet.
58
59 uint32_t data_size; ///< The size of the remaining video data.
60 uint64_t data_offset; ///< The offset of the video data within the file.
61
62 uint32_t current_frame; ///< The current frame within this video packet.
63 uint32_t frame_count; ///< The amount of frames within this video packet.
64
65 int has_extradata; ///< Does the video packet contain extra data?
66 uint8_t extradata[4]; ///< The extra data
67
68 int64_t last_pts; ///< PTS of the last video frame.
69 int64_t pts; ///< PTS of the most current video frame.
70} XMVVideoPacket;
71
72/** An audio packet with an XMV file. */
73typedef struct XMVAudioPacket {
74 int created;
75 int stream_index; ///< The decoder stream index for this audio packet.
76
77 /* Stream format properties. */
78 uint16_t compression; ///< The type of compression.
79 uint16_t channels; ///< Number of channels.
80 int32_t sample_rate; ///< Sampling rate.
81 uint16_t bits_per_sample; ///< Bits per compressed sample.
82 uint32_t bit_rate; ///< Bits of compressed data per second.
83 uint16_t flags; ///< Flags
84 unsigned block_align; ///< Bytes per compressed block.
85 uint16_t block_samples; ///< Decompressed samples per compressed block.
86
87 enum AVCodecID codec_id; ///< The codec ID of the compression scheme.
88
89 uint32_t data_size; ///< The size of the remaining audio data.
90 uint64_t data_offset; ///< The offset of the audio data within the file.
91
92 uint32_t frame_size; ///< Number of bytes to put into an audio frame.
93
94 uint64_t block_count; ///< Running counter of decompressed audio block.
95} XMVAudioPacket;
96
97/** Context for demuxing an XMV file. */
98typedef struct XMVDemuxContext {
99 uint16_t audio_track_count; ///< Number of audio track in this file.
100
101 uint32_t this_packet_size; ///< Size of the current packet.
102 uint32_t next_packet_size; ///< Size of the next packet.
103
104 uint64_t this_packet_offset; ///< Offset of the current packet.
105 uint64_t next_packet_offset; ///< Offset of the next packet.
106
107 uint16_t current_stream; ///< The index of the stream currently handling.
108 uint16_t stream_count; ///< The number of streams in this file.
109
110 uint32_t video_duration;
111 uint32_t video_width;
112 uint32_t video_height;
113
114 XMVVideoPacket video; ///< The video packet contained in each packet.
115 XMVAudioPacket *audio; ///< The audio packets contained in each packet.
116} XMVDemuxContext;
117
118static int xmv_probe(AVProbeData *p)
119{
120 uint32_t file_version;
121
122 if (p->buf_size < XMV_MIN_HEADER_SIZE)
123 return 0;
124
125 file_version = AV_RL32(p->buf + 16);
126 if ((file_version == 0) || (file_version > 4))
127 return 0;
128
129 if (!memcmp(p->buf + 12, "xobX", 4))
130 return AVPROBE_SCORE_MAX;
131
132 return 0;
133}
134
135static int xmv_read_close(AVFormatContext *s)
136{
137 XMVDemuxContext *xmv = s->priv_data;
138
139 av_freep(&xmv->audio);
140
141 return 0;
142}
143
144static int xmv_read_header(AVFormatContext *s)
145{
146 XMVDemuxContext *xmv = s->priv_data;
147 AVIOContext *pb = s->pb;
148
149 uint32_t file_version;
150 uint32_t this_packet_size;
151 uint16_t audio_track;
152 int ret;
153
154 s->ctx_flags |= AVFMTCTX_NOHEADER;
155
156 avio_skip(pb, 4); /* Next packet size */
157
158 this_packet_size = avio_rl32(pb);
159
160 avio_skip(pb, 4); /* Max packet size */
161 avio_skip(pb, 4); /* "xobX" */
162
163 file_version = avio_rl32(pb);
164 if ((file_version != 4) && (file_version != 2))
165 avpriv_request_sample(s, "Uncommon version %"PRIu32"", file_version);
166
167 /* Video tracks */
168
169 xmv->video_width = avio_rl32(pb);
170 xmv->video_height = avio_rl32(pb);
171 xmv->video_duration = avio_rl32(pb);
172
173 /* Audio tracks */
174
175 xmv->audio_track_count = avio_rl16(pb);
176
177 avio_skip(pb, 2); /* Unknown (padding?) */
178
179 xmv->audio = av_mallocz_array(xmv->audio_track_count, sizeof(XMVAudioPacket));
180 if (!xmv->audio) {
181 ret = AVERROR(ENOMEM);
182 goto fail;
183 }
184
185 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
186 XMVAudioPacket *packet = &xmv->audio[audio_track];
187
188 packet->compression = avio_rl16(pb);
189 packet->channels = avio_rl16(pb);
190 packet->sample_rate = avio_rl32(pb);
191 packet->bits_per_sample = avio_rl16(pb);
192 packet->flags = avio_rl16(pb);
193
194 packet->bit_rate = packet->bits_per_sample *
195 packet->sample_rate *
196 packet->channels;
197 packet->block_align = XMV_BLOCK_ALIGN_SIZE * packet->channels;
198 packet->block_samples = 64;
199 packet->codec_id = ff_wav_codec_get_id(packet->compression,
200 packet->bits_per_sample);
201
202 packet->stream_index = -1;
203
204 packet->frame_size = 0;
205 packet->block_count = 0;
206
207 /* TODO: ADPCM'd 5.1 sound is encoded in three separate streams.
208 * Those need to be interleaved to a proper 5.1 stream. */
209 if (packet->flags & XMV_AUDIO_ADPCM51)
210 av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream "
211 "(0x%04X)\n", packet->flags);
212
213 if (!packet->channels || packet->sample_rate <= 0 ||
214 packet->channels >= UINT16_MAX / XMV_BLOCK_ALIGN_SIZE) {
215 av_log(s, AV_LOG_ERROR, "Invalid parameters for audio track %"PRIu16".\n",
216 audio_track);
217 ret = AVERROR_INVALIDDATA;
218 goto fail;
219 }
220 }
221
222
223 /* Initialize the packet context */
224
225 xmv->next_packet_offset = avio_tell(pb);
226 xmv->next_packet_size = this_packet_size - xmv->next_packet_offset;
227 xmv->stream_count = xmv->audio_track_count + 1;
228
229 return 0;
230
231fail:
232 xmv_read_close(s);
233 return ret;
234}
235
236static void xmv_read_extradata(uint8_t *extradata, AVIOContext *pb)
237{
238 /* Read the XMV extradata */
239
240 uint32_t data = avio_rl32(pb);
241
242 int mspel_bit = !!(data & 0x01);
243 int loop_filter = !!(data & 0x02);
244 int abt_flag = !!(data & 0x04);
245 int j_type_bit = !!(data & 0x08);
246 int top_left_mv_flag = !!(data & 0x10);
247 int per_mb_rl_bit = !!(data & 0x20);
248 int slice_count = (data >> 6) & 7;
249
250 /* Write it back as standard WMV2 extradata */
251
252 data = 0;
253
254 data |= mspel_bit << 15;
255 data |= loop_filter << 14;
256 data |= abt_flag << 13;
257 data |= j_type_bit << 12;
258 data |= top_left_mv_flag << 11;
259 data |= per_mb_rl_bit << 10;
260 data |= slice_count << 7;
261
262 AV_WB32(extradata, data);
263}
264
265static int xmv_process_packet_header(AVFormatContext *s)
266{
267 XMVDemuxContext *xmv = s->priv_data;
268 AVIOContext *pb = s->pb;
269 int ret;
270
271 uint8_t data[8];
272 uint16_t audio_track;
273 uint64_t data_offset;
274
275 /* Next packet size */
276 xmv->next_packet_size = avio_rl32(pb);
277
278 /* Packet video header */
279
280 if (avio_read(pb, data, 8) != 8)
281 return AVERROR(EIO);
282
283 xmv->video.data_size = AV_RL32(data) & 0x007FFFFF;
284
285 xmv->video.current_frame = 0;
286 xmv->video.frame_count = (AV_RL32(data) >> 23) & 0xFF;
287
288 xmv->video.has_extradata = (data[3] & 0x80) != 0;
289
290 if (!xmv->video.created) {
291 AVStream *vst = avformat_new_stream(s, NULL);
292 if (!vst)
293 return AVERROR(ENOMEM);
294
295 avpriv_set_pts_info(vst, 32, 1, 1000);
296
297 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
298 vst->codecpar->codec_id = AV_CODEC_ID_WMV2;
299 vst->codecpar->codec_tag = MKBETAG('W', 'M', 'V', '2');
300 vst->codecpar->width = xmv->video_width;
301 vst->codecpar->height = xmv->video_height;
302
303 vst->duration = xmv->video_duration;
304
305 xmv->video.stream_index = vst->index;
306
307 xmv->video.created = 1;
308 }
309
310 /* Adding the audio data sizes and the video data size keeps you 4 bytes
311 * short for every audio track. But as playing around with XMV files with
312 * ADPCM audio showed, taking the extra 4 bytes from the audio data gives
313 * you either completely distorted audio or click (when skipping the
314 * remaining 68 bytes of the ADPCM block). Subtracting 4 bytes for every
315 * audio track from the video data works at least for the audio. Probably
316 * some alignment thing?
317 * The video data has (always?) lots of padding, so it should work out...
318 */
319 xmv->video.data_size -= xmv->audio_track_count * 4;
320
321 xmv->current_stream = 0;
322 if (!xmv->video.frame_count) {
323 xmv->video.frame_count = 1;
324 xmv->current_stream = xmv->stream_count > 1;
325 }
326
327 /* Packet audio header */
328
329 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
330 XMVAudioPacket *packet = &xmv->audio[audio_track];
331
332 if (avio_read(pb, data, 4) != 4)
333 return AVERROR(EIO);
334
335 if (!packet->created) {
336 AVStream *ast = avformat_new_stream(s, NULL);
337 if (!ast)
338 return AVERROR(ENOMEM);
339
340 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
341 ast->codecpar->codec_id = packet->codec_id;
342 ast->codecpar->codec_tag = packet->compression;
343 ast->codecpar->channels = packet->channels;
344 ast->codecpar->sample_rate = packet->sample_rate;
345 ast->codecpar->bits_per_coded_sample = packet->bits_per_sample;
346 ast->codecpar->bit_rate = packet->bit_rate;
347 ast->codecpar->block_align = 36 * packet->channels;
348
349 avpriv_set_pts_info(ast, 32, packet->block_samples, packet->sample_rate);
350
351 packet->stream_index = ast->index;
352
353 ast->duration = xmv->video_duration;
354
355 packet->created = 1;
356 }
357
358 packet->data_size = AV_RL32(data) & 0x007FFFFF;
359 if ((packet->data_size == 0) && (audio_track != 0))
360 /* This happens when I create an XMV with several identical audio
361 * streams. From the size calculations, duplicating the previous
362 * stream's size works out, but the track data itself is silent.
363 * Maybe this should also redirect the offset to the previous track?
364 */
365 packet->data_size = xmv->audio[audio_track - 1].data_size;
366
367 /* Carve up the audio data in frame_count slices */
368 packet->frame_size = packet->data_size / xmv->video.frame_count;
369 packet->frame_size -= packet->frame_size % packet->block_align;
370 }
371
372 /* Packet data offsets */
373
374 data_offset = avio_tell(pb);
375
376 xmv->video.data_offset = data_offset;
377 data_offset += xmv->video.data_size;
378
379 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
380 xmv->audio[audio_track].data_offset = data_offset;
381 data_offset += xmv->audio[audio_track].data_size;
382 }
383
384 /* Video frames header */
385
386 /* Read new video extra data */
387 if (xmv->video.data_size > 0) {
388 if (xmv->video.has_extradata) {
389 xmv_read_extradata(xmv->video.extradata, pb);
390
391 xmv->video.data_size -= 4;
392 xmv->video.data_offset += 4;
393
394 if (xmv->video.stream_index >= 0) {
395 AVStream *vst = s->streams[xmv->video.stream_index];
396
397 av_assert0(xmv->video.stream_index < s->nb_streams);
398
399 if (vst->codecpar->extradata_size < 4) {
400 av_freep(&vst->codecpar->extradata);
401
402 if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0)
403 return ret;
404 }
405
406 memcpy(vst->codecpar->extradata, xmv->video.extradata, 4);
407 }
408 }
409 }
410
411 return 0;
412}
413
414static int xmv_fetch_new_packet(AVFormatContext *s)
415{
416 XMVDemuxContext *xmv = s->priv_data;
417 AVIOContext *pb = s->pb;
418 int result;
419
420 if (xmv->this_packet_offset == xmv->next_packet_offset)
421 return AVERROR_EOF;
422
423 /* Seek to it */
424 xmv->this_packet_offset = xmv->next_packet_offset;
425 if (avio_seek(pb, xmv->this_packet_offset, SEEK_SET) != xmv->this_packet_offset)
426 return AVERROR(EIO);
427
428 /* Update the size */
429 xmv->this_packet_size = xmv->next_packet_size;
430 if (xmv->this_packet_size < (12 + xmv->audio_track_count * 4))
431 return AVERROR(EIO);
432
433 /* Process the header */
434 result = xmv_process_packet_header(s);
435 if (result)
436 return result;
437
438 /* Update the offset */
439 xmv->next_packet_offset = xmv->this_packet_offset + xmv->this_packet_size;
440
441 return 0;
442}
443
444static int xmv_fetch_audio_packet(AVFormatContext *s,
445 AVPacket *pkt, uint32_t stream)
446{
447 XMVDemuxContext *xmv = s->priv_data;
448 AVIOContext *pb = s->pb;
449 XMVAudioPacket *audio = &xmv->audio[stream];
450
451 uint32_t data_size;
452 uint32_t block_count;
453 int result;
454
455 /* Seek to it */
456 if (avio_seek(pb, audio->data_offset, SEEK_SET) != audio->data_offset)
457 return AVERROR(EIO);
458
459 if ((xmv->video.current_frame + 1) < xmv->video.frame_count)
460 /* Not the last frame, get at most frame_size bytes. */
461 data_size = FFMIN(audio->frame_size, audio->data_size);
462 else
463 /* Last frame, get the rest. */
464 data_size = audio->data_size;
465
466 /* Read the packet */
467 result = av_get_packet(pb, pkt, data_size);
468 if (result <= 0)
469 return result;
470
471 pkt->stream_index = audio->stream_index;
472
473 /* Calculate the PTS */
474
475 block_count = data_size / audio->block_align;
476
477 pkt->duration = block_count;
478 pkt->pts = audio->block_count;
479 pkt->dts = AV_NOPTS_VALUE;
480
481 audio->block_count += block_count;
482
483 /* Advance offset */
484 audio->data_size -= data_size;
485 audio->data_offset += data_size;
486
487 return 0;
488}
489
490static int xmv_fetch_video_packet(AVFormatContext *s,
491 AVPacket *pkt)
492{
493 XMVDemuxContext *xmv = s->priv_data;
494 AVIOContext *pb = s->pb;
495 XMVVideoPacket *video = &xmv->video;
496
497 int result;
498 uint32_t frame_header;
499 uint32_t frame_size, frame_timestamp;
500 uint8_t *data, *end;
501
502 /* Seek to it */
503 if (avio_seek(pb, video->data_offset, SEEK_SET) != video->data_offset)
504 return AVERROR(EIO);
505
506 /* Read the frame header */
507 frame_header = avio_rl32(pb);
508
509 frame_size = (frame_header & 0x1FFFF) * 4 + 4;
510 frame_timestamp = (frame_header >> 17);
511
512 if ((frame_size + 4) > video->data_size)
513 return AVERROR(EIO);
514
515 /* Get the packet data */
516 result = av_get_packet(pb, pkt, frame_size);
517 if (result != frame_size)
518 return result;
519
520 /* Contrary to normal WMV2 video, the bit stream in XMV's
521 * WMV2 is little-endian.
522 * TODO: This manual swap is of course suboptimal.
523 */
524 for (data = pkt->data, end = pkt->data + frame_size; data < end; data += 4)
525 AV_WB32(data, AV_RL32(data));
526
527 pkt->stream_index = video->stream_index;
528
529 /* Calculate the PTS */
530
531 video->last_pts = frame_timestamp + video->pts;
532
533 pkt->duration = 0;
534 pkt->pts = video->last_pts;
535 pkt->dts = AV_NOPTS_VALUE;
536
537 video->pts += frame_timestamp;
538
539 /* Keyframe? */
540 pkt->flags = (pkt->data[0] & 0x80) ? 0 : AV_PKT_FLAG_KEY;
541
542 /* Advance offset */
543 video->data_size -= frame_size + 4;
544 video->data_offset += frame_size + 4;
545
546 return 0;
547}
548
549static int xmv_read_packet(AVFormatContext *s,
550 AVPacket *pkt)
551{
552 XMVDemuxContext *xmv = s->priv_data;
553 int result;
554
555 if (xmv->video.current_frame == xmv->video.frame_count) {
556 /* No frames left in this packet, so we fetch a new one */
557
558 result = xmv_fetch_new_packet(s);
559 if (result)
560 return result;
561 }
562
563 if (xmv->current_stream == 0) {
564 /* Fetch a video frame */
565
566 result = xmv_fetch_video_packet(s, pkt);
567 } else {
568 /* Fetch an audio frame */
569
570 result = xmv_fetch_audio_packet(s, pkt, xmv->current_stream - 1);
571 }
572 if (result) {
573 xmv->current_stream = 0;
574 xmv->video.current_frame = xmv->video.frame_count;
575 return result;
576 }
577
578
579 /* Increase our counters */
580 if (++xmv->current_stream >= xmv->stream_count) {
581 xmv->current_stream = 0;
582 xmv->video.current_frame += 1;
583 }
584
585 return 0;
586}
587
588AVInputFormat ff_xmv_demuxer = {
589 .name = "xmv",
590 .long_name = NULL_IF_CONFIG_SMALL("Microsoft XMV"),
591 .extensions = "xmv",
592 .priv_data_size = sizeof(XMVDemuxContext),
593 .read_probe = xmv_probe,
594 .read_header = xmv_read_header,
595 .read_packet = xmv_read_packet,
596 .read_close = xmv_read_close,
597};
598
generated by cgit at 2024-05-17 06:08:35 (GMT)