FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/xmv.c
Date: 2024-05-04 02:01:39
Exec Total Coverage
Lines: 208 231 90.0%
Functions: 9 9 100.0%
Branches: 61 90 67.8%
Line Branch Exec Source
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 #include "libavutil/mem.h"
32
33 #include "avformat.h"
34 #include "demux.h"
35 #include "internal.h"
36 #include "riff.h"
37 #include "libavutil/avassert.h"
38
39 /** The min size of an XMV header. */
40 #define XMV_MIN_HEADER_SIZE 36
41
42 /** Audio flag: ADPCM'd 5.1 stream, front left / right channels */
43 #define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1
44 /** Audio flag: ADPCM'd 5.1 stream, front center / low frequency channels */
45 #define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2
46 /** Audio flag: ADPCM'd 5.1 stream, rear left / right channels */
47 #define XMV_AUDIO_ADPCM51_REARLEFTRIGHT 4
48
49 /** Audio flag: Any of the ADPCM'd 5.1 stream flags. */
50 #define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \
51 XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \
52 XMV_AUDIO_ADPCM51_REARLEFTRIGHT)
53
54 #define XMV_BLOCK_ALIGN_SIZE 36
55
56 /** A video packet with an XMV file. */
57 typedef struct XMVVideoPacket {
58 int created;
59 int stream_index; ///< The decoder stream index for this video packet.
60
61 uint32_t data_size; ///< The size of the remaining video data.
62 uint64_t data_offset; ///< The offset of the video data within the file.
63
64 uint32_t current_frame; ///< The current frame within this video packet.
65 uint32_t frame_count; ///< The amount of frames within this video packet.
66
67 int has_extradata; ///< Does the video packet contain extra data?
68 uint8_t extradata[4]; ///< The extra data
69
70 int64_t last_pts; ///< PTS of the last video frame.
71 int64_t pts; ///< PTS of the most current video frame.
72 } XMVVideoPacket;
73
74 /** An audio packet with an XMV file. */
75 typedef struct XMVAudioPacket {
76 int created;
77 int stream_index; ///< The decoder stream index for this audio packet.
78
79 /* Stream format properties. */
80 uint16_t compression; ///< The type of compression.
81 uint16_t channels; ///< Number of channels.
82 int32_t sample_rate; ///< Sampling rate.
83 uint16_t bits_per_sample; ///< Bits per compressed sample.
84 uint64_t bit_rate; ///< Bits of compressed data per second.
85 uint16_t flags; ///< Flags
86 unsigned block_align; ///< Bytes per compressed block.
87 uint16_t block_samples; ///< Decompressed samples per compressed block.
88
89 enum AVCodecID codec_id; ///< The codec ID of the compression scheme.
90
91 uint32_t data_size; ///< The size of the remaining audio data.
92 uint64_t data_offset; ///< The offset of the audio data within the file.
93
94 uint32_t frame_size; ///< Number of bytes to put into an audio frame.
95
96 uint64_t block_count; ///< Running counter of decompressed audio block.
97 } XMVAudioPacket;
98
99 /** Context for demuxing an XMV file. */
100 typedef struct XMVDemuxContext {
101 uint16_t audio_track_count; ///< Number of audio track in this file.
102
103 uint32_t this_packet_size; ///< Size of the current packet.
104 uint32_t next_packet_size; ///< Size of the next packet.
105
106 uint64_t this_packet_offset; ///< Offset of the current packet.
107 uint64_t next_packet_offset; ///< Offset of the next packet.
108
109 uint16_t current_stream; ///< The index of the stream currently handling.
110 uint16_t stream_count; ///< The number of streams in this file.
111
112 uint32_t video_duration;
113 uint32_t video_width;
114 uint32_t video_height;
115
116 XMVVideoPacket video; ///< The video packet contained in each packet.
117 XMVAudioPacket *audio; ///< The audio packets contained in each packet.
118 } XMVDemuxContext;
119
120 7128 static int xmv_probe(const AVProbeData *p)
121 {
122 uint32_t file_version;
123
124
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 7128 if (p->buf_size < XMV_MIN_HEADER_SIZE)
125 1 return 0;
126
127 7127 file_version = AV_RL32(p->buf + 16);
128
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 7127 if ((file_version == 0) || (file_version > 4))
129 7093 return 0;
130
131
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 34 if (!memcmp(p->buf + 12, "xobX", 4))
132 1 return AVPROBE_SCORE_MAX;
133
134 33 return 0;
135 }
136
137 1 static int xmv_read_close(AVFormatContext *s)
138 {
139 1 XMVDemuxContext *xmv = s->priv_data;
140
141 1 av_freep(&xmv->audio);
142
143 1 return 0;
144 }
145
146 1 static int xmv_read_header(AVFormatContext *s)
147 {
148 1 XMVDemuxContext *xmv = s->priv_data;
149 1 AVIOContext *pb = s->pb;
150
151 uint32_t file_version;
152 uint32_t this_packet_size;
153 uint16_t audio_track;
154
155 1 s->ctx_flags |= AVFMTCTX_NOHEADER;
156
157 1 avio_skip(pb, 4); /* Next packet size */
158
159 1 this_packet_size = avio_rl32(pb);
160
161 1 avio_skip(pb, 4); /* Max packet size */
162 1 avio_skip(pb, 4); /* "xobX" */
163
164 1 file_version = avio_rl32(pb);
165
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 1 if ((file_version != 4) && (file_version != 2))
166 ✗ avpriv_request_sample(s, "Uncommon version %"PRIu32"", file_version);
167
168 /* Video tracks */
169
170 1 xmv->video_width = avio_rl32(pb);
171 1 xmv->video_height = avio_rl32(pb);
172 1 xmv->video_duration = avio_rl32(pb);
173
174 /* Audio tracks */
175
176 1 xmv->audio_track_count = avio_rl16(pb);
177
178 1 avio_skip(pb, 2); /* Unknown (padding?) */
179
180 1 xmv->audio = av_calloc(xmv->audio_track_count, sizeof(*xmv->audio));
181
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 1 if (!xmv->audio)
182 ✗ return AVERROR(ENOMEM);
183
184
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 2 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
185 1 XMVAudioPacket *packet = &xmv->audio[audio_track];
186
187 1 packet->compression = avio_rl16(pb);
188 1 packet->channels = avio_rl16(pb);
189 1 packet->sample_rate = avio_rl32(pb);
190 1 packet->bits_per_sample = avio_rl16(pb);
191 1 packet->flags = avio_rl16(pb);
192
193 1 packet->bit_rate = (uint64_t)packet->bits_per_sample *
194 1 packet->sample_rate *
195 1 packet->channels;
196 1 packet->block_align = XMV_BLOCK_ALIGN_SIZE * packet->channels;
197 1 packet->block_samples = 64;
198 2 packet->codec_id = ff_wav_codec_get_id(packet->compression,
199 1 packet->bits_per_sample);
200
201 1 packet->stream_index = -1;
202
203 1 packet->frame_size = 0;
204 1 packet->block_count = 0;
205
206 /* TODO: ADPCM'd 5.1 sound is encoded in three separate streams.
207 * Those need to be interleaved to a proper 5.1 stream. */
208
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 1 if (packet->flags & XMV_AUDIO_ADPCM51)
209 ✗ av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream "
210 ✗ "(0x%04X)\n", packet->flags);
211
212
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 1 if (!packet->channels || packet->sample_rate <= 0 ||
213
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 1 packet->channels >= UINT16_MAX / XMV_BLOCK_ALIGN_SIZE) {
214 ✗ av_log(s, AV_LOG_ERROR, "Invalid parameters for audio track %"PRIu16".\n",
215 audio_track);
216 ✗ return AVERROR_INVALIDDATA;
217 }
218 }
219
220
221 /* Initialize the packet context */
222
223 1 xmv->next_packet_offset = avio_tell(pb);
224 1 xmv->next_packet_size = this_packet_size - xmv->next_packet_offset;
225 1 xmv->stream_count = xmv->audio_track_count + 1;
226
227 1 return 0;
228 }
229
230 1 static void xmv_read_extradata(uint8_t *extradata, AVIOContext *pb)
231 {
232 /* Read the XMV extradata */
233
234 1 uint32_t data = avio_rl32(pb);
235
236 1 int mspel_bit = !!(data & 0x01);
237 1 int loop_filter = !!(data & 0x02);
238 1 int abt_flag = !!(data & 0x04);
239 1 int j_type_bit = !!(data & 0x08);
240 1 int top_left_mv_flag = !!(data & 0x10);
241 1 int per_mb_rl_bit = !!(data & 0x20);
242 1 int slice_count = (data >> 6) & 7;
243
244 /* Write it back as standard WMV2 extradata */
245
246 1 data = 0;
247
248 1 data |= mspel_bit << 15;
249 1 data |= loop_filter << 14;
250 1 data |= abt_flag << 13;
251 1 data |= j_type_bit << 12;
252 1 data |= top_left_mv_flag << 11;
253 1 data |= per_mb_rl_bit << 10;
254 1 data |= slice_count << 7;
255
256 1 AV_WB32(extradata, data);
257 1 }
258
259 18 static int xmv_process_packet_header(AVFormatContext *s)
260 {
261 18 XMVDemuxContext *xmv = s->priv_data;
262 18 AVIOContext *pb = s->pb;
263 int ret;
264
265 uint8_t data[8];
266 uint16_t audio_track;
267 uint64_t data_offset;
268
269 /* Next packet size */
270 18 xmv->next_packet_size = avio_rl32(pb);
271
272 /* Packet video header */
273
274
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 18 if (avio_read(pb, data, 8) != 8)
275 ✗ return AVERROR(EIO);
276
277 18 xmv->video.data_size = AV_RL32(data) & 0x007FFFFF;
278
279 18 xmv->video.current_frame = 0;
280 18 xmv->video.frame_count = (AV_RL32(data) >> 23) & 0xFF;
281
282 18 xmv->video.has_extradata = (data[3] & 0x80) != 0;
283
284
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 18 if (!xmv->video.created) {
285 1 AVStream *vst = avformat_new_stream(s, NULL);
286
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 1 if (!vst)
287 ✗ return AVERROR(ENOMEM);
288
289 1 avpriv_set_pts_info(vst, 32, 1, 1000);
290
291 1 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
292 1 vst->codecpar->codec_id = AV_CODEC_ID_WMV2;
293 1 vst->codecpar->codec_tag = MKBETAG('W', 'M', 'V', '2');
294 1 vst->codecpar->width = xmv->video_width;
295 1 vst->codecpar->height = xmv->video_height;
296
297 1 vst->duration = xmv->video_duration;
298
299 1 xmv->video.stream_index = vst->index;
300
301 1 xmv->video.created = 1;
302 }
303
304 /* Adding the audio data sizes and the video data size keeps you 4 bytes
305 * short for every audio track. But as playing around with XMV files with
306 * ADPCM audio showed, taking the extra 4 bytes from the audio data gives
307 * you either completely distorted audio or click (when skipping the
308 * remaining 68 bytes of the ADPCM block). Subtracting 4 bytes for every
309 * audio track from the video data works at least for the audio. Probably
310 * some alignment thing?
311 * The video data has (always?) lots of padding, so it should work out...
312 */
313 18 xmv->video.data_size -= xmv->audio_track_count * 4;
314
315 18 xmv->current_stream = 0;
316
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 18 if (!xmv->video.frame_count) {
317 1 xmv->video.frame_count = 1;
318 1 xmv->current_stream = xmv->stream_count > 1;
319 }
320
321 /* Packet audio header */
322
323
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 36 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
324 18 XMVAudioPacket *packet = &xmv->audio[audio_track];
325
326
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 18 if (avio_read(pb, data, 4) != 4)
327 ✗ return AVERROR(EIO);
328
329
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 18 if (!packet->created) {
330 1 AVStream *ast = avformat_new_stream(s, NULL);
331
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 1 if (!ast)
332 ✗ return AVERROR(ENOMEM);
333
334 1 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
335 1 ast->codecpar->codec_id = packet->codec_id;
336 1 ast->codecpar->codec_tag = packet->compression;
337 1 ast->codecpar->ch_layout.nb_channels = packet->channels;
338 1 ast->codecpar->sample_rate = packet->sample_rate;
339 1 ast->codecpar->bits_per_coded_sample = packet->bits_per_sample;
340 1 ast->codecpar->bit_rate = packet->bit_rate;
341 1 ast->codecpar->block_align = 36 * packet->channels;
342
343 1 avpriv_set_pts_info(ast, 32, packet->block_samples, packet->sample_rate);
344
345 1 packet->stream_index = ast->index;
346
347 1 ast->duration = xmv->video_duration;
348
349 1 packet->created = 1;
350 }
351
352 18 packet->data_size = AV_RL32(data) & 0x007FFFFF;
353
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 18 if ((packet->data_size == 0) && (audio_track != 0))
354 /* This happens when I create an XMV with several identical audio
355 * streams. From the size calculations, duplicating the previous
356 * stream's size works out, but the track data itself is silent.
357 * Maybe this should also redirect the offset to the previous track?
358 */
359 ✗ packet->data_size = xmv->audio[audio_track - 1].data_size;
360
361 /* Carve up the audio data in frame_count slices */
362 18 packet->frame_size = packet->data_size / xmv->video.frame_count;
363 18 packet->frame_size -= packet->frame_size % packet->block_align;
364 }
365
366 /* Packet data offsets */
367
368 18 data_offset = avio_tell(pb);
369
370 18 xmv->video.data_offset = data_offset;
371 18 data_offset += xmv->video.data_size;
372
373
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 36 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
374 18 xmv->audio[audio_track].data_offset = data_offset;
375 18 data_offset += xmv->audio[audio_track].data_size;
376 }
377
378 /* Video frames header */
379
380 /* Read new video extra data */
381
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 18 if (xmv->video.data_size > 0) {
382
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 18 if (xmv->video.has_extradata) {
383 1 xmv_read_extradata(xmv->video.extradata, pb);
384
385 1 xmv->video.data_size -= 4;
386 1 xmv->video.data_offset += 4;
387
388
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 1 if (xmv->video.stream_index >= 0) {
389 1 AVStream *vst = s->streams[xmv->video.stream_index];
390
391
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 1 av_assert0(xmv->video.stream_index < s->nb_streams);
392
393
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 1 if (vst->codecpar->extradata_size < 4) {
394
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 1 if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0)
395 ✗ return ret;
396 }
397
398 1 memcpy(vst->codecpar->extradata, xmv->video.extradata, 4);
399 }
400 }
401 }
402
403 18 return 0;
404 }
405
406 19 static int xmv_fetch_new_packet(AVFormatContext *s)
407 {
408 19 XMVDemuxContext *xmv = s->priv_data;
409 19 AVIOContext *pb = s->pb;
410 int result;
411
412
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 19 if (xmv->this_packet_offset == xmv->next_packet_offset)
413 ✗ return AVERROR_EOF;
414
415 /* Seek to it */
416 19 xmv->this_packet_offset = xmv->next_packet_offset;
417
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 19 if (avio_seek(pb, xmv->this_packet_offset, SEEK_SET) != xmv->this_packet_offset)
418 ✗ return AVERROR(EIO);
419
420 /* Update the size */
421 19 xmv->this_packet_size = xmv->next_packet_size;
422
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 19 if (xmv->this_packet_size < (12 + xmv->audio_track_count * 4))
423 1 return AVERROR(EIO);
424
425 /* Process the header */
426 18 result = xmv_process_packet_header(s);
427
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 18 if (result)
428 ✗ return result;
429
430 /* Update the offset */
431 18 xmv->next_packet_offset = xmv->this_packet_offset + xmv->this_packet_size;
432
433 18 return 0;
434 }
435
436 91 static int xmv_fetch_audio_packet(AVFormatContext *s,
437 AVPacket *pkt, uint32_t stream)
438 {
439 91 XMVDemuxContext *xmv = s->priv_data;
440 91 AVIOContext *pb = s->pb;
441 91 XMVAudioPacket *audio = &xmv->audio[stream];
442
443 uint32_t data_size;
444 uint32_t block_count;
445 int result;
446
447 /* Seek to it */
448
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 91 if (avio_seek(pb, audio->data_offset, SEEK_SET) != audio->data_offset)
449 ✗ return AVERROR(EIO);
450
451
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 91 if ((xmv->video.current_frame + 1) < xmv->video.frame_count)
452 /* Not the last frame, get at most frame_size bytes. */
453 73 data_size = FFMIN(audio->frame_size, audio->data_size);
454 else
455 /* Last frame, get the rest. */
456 18 data_size = audio->data_size;
457
458 /* Read the packet */
459 91 result = av_get_packet(pb, pkt, data_size);
460
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 91 if (result <= 0)
461 ✗ return result;
462
463 91 pkt->stream_index = audio->stream_index;
464
465 /* Calculate the PTS */
466
467 91 block_count = data_size / audio->block_align;
468
469 91 pkt->duration = block_count;
470 91 pkt->pts = audio->block_count;
471 91 pkt->dts = AV_NOPTS_VALUE;
472
473 91 audio->block_count += block_count;
474
475 /* Advance offset */
476 91 audio->data_size -= data_size;
477 91 audio->data_offset += data_size;
478
479 91 return 0;
480 }
481
482 90 static int xmv_fetch_video_packet(AVFormatContext *s,
483 AVPacket *pkt)
484 {
485 90 XMVDemuxContext *xmv = s->priv_data;
486 90 AVIOContext *pb = s->pb;
487 90 XMVVideoPacket *video = &xmv->video;
488
489 int result;
490 uint32_t frame_header;
491 uint32_t frame_size, frame_timestamp;
492 uint8_t *data, *end;
493
494 /* Seek to it */
495
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 90 if (avio_seek(pb, video->data_offset, SEEK_SET) != video->data_offset)
496 ✗ return AVERROR(EIO);
497
498 /* Read the frame header */
499 90 frame_header = avio_rl32(pb);
500
501 90 frame_size = (frame_header & 0x1FFFF) * 4 + 4;
502 90 frame_timestamp = (frame_header >> 17);
503
504
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 90 if ((frame_size + 4) > video->data_size)
505 ✗ return AVERROR(EIO);
506
507 /* Get the packet data */
508 90 result = av_get_packet(pb, pkt, frame_size);
509
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 90 if (result != frame_size)
510 ✗ return result;
511
512 /* Contrary to normal WMV2 video, the bit stream in XMV's
513 * WMV2 is little-endian.
514 * TODO: This manual swap is of course suboptimal.
515 */
516
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 135215 for (data = pkt->data, end = pkt->data + frame_size; data < end; data += 4)
517 135125 AV_WB32(data, AV_RL32(data));
518
519 90 pkt->stream_index = video->stream_index;
520
521 /* Calculate the PTS */
522
523 90 video->last_pts = frame_timestamp + video->pts;
524
525 90 pkt->duration = 0;
526 90 pkt->pts = video->last_pts;
527 90 pkt->dts = AV_NOPTS_VALUE;
528
529 90 video->pts += frame_timestamp;
530
531 /* Keyframe? */
532 90 pkt->flags = (pkt->data[0] & 0x80) ? 0 : AV_PKT_FLAG_KEY;
533
534 /* Advance offset */
535 90 video->data_size -= frame_size + 4;
536 90 video->data_offset += frame_size + 4;
537
538 90 return 0;
539 }
540
541 182 static int xmv_read_packet(AVFormatContext *s,
542 AVPacket *pkt)
543 {
544 182 XMVDemuxContext *xmv = s->priv_data;
545 int result;
546
547
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 182 if (xmv->video.current_frame == xmv->video.frame_count) {
548 /* No frames left in this packet, so we fetch a new one */
549
550 19 result = xmv_fetch_new_packet(s);
551
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 19 if (result)
552 1 return result;
553 }
554
555
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 181 if (xmv->current_stream == 0) {
556 /* Fetch a video frame */
557
558 90 result = xmv_fetch_video_packet(s, pkt);
559 } else {
560 /* Fetch an audio frame */
561
562 91 result = xmv_fetch_audio_packet(s, pkt, xmv->current_stream - 1);
563 }
564
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 181 if (result) {
565 ✗ xmv->current_stream = 0;
566 ✗ xmv->video.current_frame = xmv->video.frame_count;
567 ✗ return result;
568 }
569
570
571 /* Increase our counters */
572
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 181 if (++xmv->current_stream >= xmv->stream_count) {
573 91 xmv->current_stream = 0;
574 91 xmv->video.current_frame += 1;
575 }
576
577 181 return 0;
578 }
579
580 const FFInputFormat ff_xmv_demuxer = {
581 .p.name = "xmv",
582 .p.long_name = NULL_IF_CONFIG_SMALL("Microsoft XMV"),
583 .p.extensions = "xmv",
584 .priv_data_size = sizeof(XMVDemuxContext),
585 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
586 .read_probe = xmv_probe,
587 .read_header = xmv_read_header,
588 .read_packet = xmv_read_packet,
589 .read_close = xmv_read_close,
590 };
591