FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/xmv.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 202 226 89.4%
Functions: 9 9 100.0%
Branches: 62 92 67.4%
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 "avio_internal.h"
35 #include "demux.h"
36 #include "internal.h"
37 #include "riff.h"
38 #include "libavutil/avassert.h"
39
40 /** The min size of an XMV header. */
41 #define XMV_MIN_HEADER_SIZE 36
42
43 /** Audio flag: ADPCM'd 5.1 stream, front left / right channels */
44 #define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1
45 /** Audio flag: ADPCM'd 5.1 stream, front center / low frequency channels */
46 #define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2
47 /** Audio flag: ADPCM'd 5.1 stream, rear left / right channels */
48 #define XMV_AUDIO_ADPCM51_REARLEFTRIGHT 4
49
50 /** Audio flag: Any of the ADPCM'd 5.1 stream flags. */
51 #define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \
52 XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \
53 XMV_AUDIO_ADPCM51_REARLEFTRIGHT)
54
55 #define XMV_BLOCK_ALIGN_SIZE 36
56
57 /** A video packet with an XMV file. */
58 typedef struct XMVVideoPacket {
59 int created;
60 int stream_index; ///< The decoder stream index for this video packet.
61
62 uint32_t data_size; ///< The size of the remaining video data.
63 uint64_t data_offset; ///< The offset of the video data within the file.
64
65 uint32_t current_frame; ///< The current frame within this video packet.
66 uint32_t frame_count; ///< The amount of frames within this video packet.
67
68 int has_extradata; ///< Does the video packet contain extra data?
69 uint8_t extradata[4]; ///< The extra data
70
71 int64_t last_pts; ///< PTS of the last video frame.
72 int64_t pts; ///< PTS of the most current video frame.
73 } XMVVideoPacket;
74
75 /** An audio packet with an XMV file. */
76 typedef struct XMVAudioPacket {
77 int created;
78 int stream_index; ///< The decoder stream index for this audio packet.
79
80 /* Stream format properties. */
81 uint16_t compression; ///< The type of compression.
82 uint16_t channels; ///< Number of channels.
83 int32_t sample_rate; ///< Sampling rate.
84 uint16_t bits_per_sample; ///< Bits per compressed sample.
85 uint64_t bit_rate; ///< Bits of compressed data per second.
86 uint16_t flags; ///< Flags
87 unsigned block_align; ///< Bytes 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 } XMVAudioPacket;
96
97 /** Context for demuxing an XMV file. */
98 typedef 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
118 7480 static int xmv_probe(const AVProbeData *p)
119 {
120 uint32_t file_version;
121
122
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 7480 if (p->buf_size < XMV_MIN_HEADER_SIZE)
123 1 return 0;
124
125 7479 file_version = AV_RL32(p->buf + 16);
126
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 7479 if ((file_version == 0) || (file_version > 4))
127 7441 return 0;
128
129
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 38 if (!memcmp(p->buf + 12, "xobX", 4))
130 1 return AVPROBE_SCORE_MAX;
131
132 37 return 0;
133 }
134
135 1 static int xmv_read_close(AVFormatContext *s)
136 {
137 1 XMVDemuxContext *xmv = s->priv_data;
138
139 1 av_freep(&xmv->audio);
140
141 1 return 0;
142 }
143
144 1 static int xmv_read_header(AVFormatContext *s)
145 {
146 1 XMVDemuxContext *xmv = s->priv_data;
147 1 AVIOContext *pb = s->pb;
148
149 uint32_t file_version;
150 uint32_t this_packet_size;
151 uint16_t audio_track;
152
153 1 s->ctx_flags |= AVFMTCTX_NOHEADER;
154
155 1 avio_skip(pb, 4); /* Next packet size */
156
157 1 this_packet_size = avio_rl32(pb);
158
159 1 avio_skip(pb, 4); /* Max packet size */
160 1 avio_skip(pb, 4); /* "xobX" */
161
162 1 file_version = avio_rl32(pb);
163
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 1 if ((file_version != 4) && (file_version != 2))
164 ✗ avpriv_request_sample(s, "Uncommon version %"PRIu32"", file_version);
165
166 /* Video tracks */
167
168 1 xmv->video_width = avio_rl32(pb);
169 1 xmv->video_height = avio_rl32(pb);
170 1 xmv->video_duration = avio_rl32(pb);
171
172 /* Audio tracks */
173
174 1 xmv->audio_track_count = avio_rl16(pb);
175
176 1 avio_skip(pb, 2); /* Unknown (padding?) */
177
178 1 xmv->audio = av_calloc(xmv->audio_track_count, sizeof(*xmv->audio));
179
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 1 if (!xmv->audio)
180 ✗ return AVERROR(ENOMEM);
181
182
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 2 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
183 1 XMVAudioPacket *packet = &xmv->audio[audio_track];
184
185 1 packet->compression = avio_rl16(pb);
186 1 packet->channels = avio_rl16(pb);
187 1 packet->sample_rate = avio_rl32(pb);
188 1 packet->bits_per_sample = avio_rl16(pb);
189 1 packet->flags = avio_rl16(pb);
190
191 1 packet->bit_rate = (uint64_t)packet->bits_per_sample *
192 1 packet->sample_rate *
193 1 packet->channels;
194 1 packet->block_align = XMV_BLOCK_ALIGN_SIZE * packet->channels;
195 2 packet->codec_id = ff_wav_codec_get_id(packet->compression,
196 1 packet->bits_per_sample);
197
198 1 packet->stream_index = -1;
199
200 1 packet->frame_size = 0;
201
202 /* TODO: ADPCM'd 5.1 sound is encoded in three separate streams.
203 * Those need to be interleaved to a proper 5.1 stream. */
204
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 1 if (packet->flags & XMV_AUDIO_ADPCM51)
205 ✗ av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream "
206 ✗ "(0x%04X)\n", packet->flags);
207
208
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 1 if (!packet->channels || packet->sample_rate <= 0 ||
209
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 1 packet->channels >= UINT16_MAX / XMV_BLOCK_ALIGN_SIZE) {
210 ✗ av_log(s, AV_LOG_ERROR, "Invalid parameters for audio track %"PRIu16".\n",
211 audio_track);
212 ✗ return AVERROR_INVALIDDATA;
213 }
214 }
215
216
217 /* Initialize the packet context */
218
219 1 xmv->next_packet_offset = avio_tell(pb);
220
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 1 if (this_packet_size < xmv->next_packet_offset)
221 ✗ return AVERROR_INVALIDDATA;
222 1 xmv->next_packet_size = this_packet_size - xmv->next_packet_offset;
223 1 xmv->stream_count = xmv->audio_track_count + 1;
224
225 1 return 0;
226 }
227
228 1 static void xmv_read_extradata(uint8_t *extradata, AVIOContext *pb)
229 {
230 /* Read the XMV extradata */
231
232 1 uint32_t data = avio_rl32(pb);
233
234 1 int mspel_bit = !!(data & 0x01);
235 1 int loop_filter = !!(data & 0x02);
236 1 int abt_flag = !!(data & 0x04);
237 1 int j_type_bit = !!(data & 0x08);
238 1 int top_left_mv_flag = !!(data & 0x10);
239 1 int per_mb_rl_bit = !!(data & 0x20);
240 1 int slice_count = (data >> 6) & 7;
241
242 /* Write it back as standard WMV2 extradata */
243
244 1 data = 0;
245
246 1 data |= mspel_bit << 15;
247 1 data |= loop_filter << 14;
248 1 data |= abt_flag << 13;
249 1 data |= j_type_bit << 12;
250 1 data |= top_left_mv_flag << 11;
251 1 data |= per_mb_rl_bit << 10;
252 1 data |= slice_count << 7;
253
254 1 AV_WB32(extradata, data);
255 1 }
256
257 18 static int xmv_process_packet_header(AVFormatContext *s)
258 {
259 18 XMVDemuxContext *xmv = s->priv_data;
260 18 AVIOContext *pb = s->pb;
261 int ret;
262
263 uint8_t data[8];
264 uint16_t audio_track;
265 uint64_t data_offset;
266
267 /* Next packet size */
268 18 xmv->next_packet_size = avio_rl32(pb);
269
270 /* Packet video header */
271
272
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 18 if ((ret = ffio_read_size(pb, data, 8)) < 0)
273 ✗ return ret;
274
275 18 xmv->video.data_size = AV_RL32(data) & 0x007FFFFF;
276
277 18 xmv->video.current_frame = 0;
278 18 xmv->video.frame_count = (AV_RL32(data) >> 23) & 0xFF;
279
280 18 xmv->video.has_extradata = (data[3] & 0x80) != 0;
281
282
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 18 if (!xmv->video.created) {
283 1 AVStream *vst = avformat_new_stream(s, NULL);
284
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 1 if (!vst)
285 ✗ return AVERROR(ENOMEM);
286
287 1 avpriv_set_pts_info(vst, 32, 1, 1000);
288
289 1 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
290 1 vst->codecpar->codec_id = AV_CODEC_ID_WMV2;
291 1 vst->codecpar->codec_tag = MKBETAG('W', 'M', 'V', '2');
292 1 vst->codecpar->width = xmv->video_width;
293 1 vst->codecpar->height = xmv->video_height;
294
295 1 vst->duration = xmv->video_duration;
296
297 1 xmv->video.stream_index = vst->index;
298
299 1 xmv->video.created = 1;
300 }
301
302 /* Adding the audio data sizes and the video data size keeps you 4 bytes
303 * short for every audio track. But as playing around with XMV files with
304 * ADPCM audio showed, taking the extra 4 bytes from the audio data gives
305 * you either completely distorted audio or click (when skipping the
306 * remaining 68 bytes of the ADPCM block). Subtracting 4 bytes for every
307 * audio track from the video data works at least for the audio. Probably
308 * some alignment thing?
309 * The video data has (always?) lots of padding, so it should work out...
310 */
311 18 xmv->video.data_size -= xmv->audio_track_count * 4;
312
313 18 xmv->current_stream = 0;
314
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 18 if (!xmv->video.frame_count) {
315 1 xmv->video.frame_count = 1;
316 1 xmv->current_stream = xmv->stream_count > 1;
317 }
318
319 /* Packet audio header */
320
321
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 36 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
322 18 XMVAudioPacket *packet = &xmv->audio[audio_track];
323
324
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 18 if ((ret = ffio_read_size(pb, data, 4)) < 0)
325 ✗ return ret;
326
327
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 18 if (!packet->created) {
328 1 AVStream *ast = avformat_new_stream(s, NULL);
329
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 1 if (!ast)
330 ✗ return AVERROR(ENOMEM);
331
332 1 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
333 1 ast->codecpar->codec_id = packet->codec_id;
334 1 ast->codecpar->codec_tag = packet->compression;
335 1 ast->codecpar->ch_layout.nb_channels = packet->channels;
336 1 ast->codecpar->sample_rate = packet->sample_rate;
337 1 ast->codecpar->bits_per_coded_sample = packet->bits_per_sample;
338 1 ast->codecpar->bit_rate = packet->bit_rate;
339 1 ast->codecpar->block_align = 36 * packet->channels;
340
341 1 avpriv_set_pts_info(ast, 32, 1, packet->sample_rate);
342
343 1 packet->stream_index = ast->index;
344
345 1 ast->duration = xmv->video_duration;
346
347 1 packet->created = 1;
348 }
349
350 18 packet->data_size = AV_RL32(data) & 0x007FFFFF;
351
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 18 if ((packet->data_size == 0) && (audio_track != 0))
352 /* This happens when I create an XMV with several identical audio
353 * streams. From the size calculations, duplicating the previous
354 * stream's size works out, but the track data itself is silent.
355 * Maybe this should also redirect the offset to the previous track?
356 */
357 ✗ packet->data_size = xmv->audio[audio_track - 1].data_size;
358
359 /* Carve up the audio data in frame_count slices */
360 18 packet->frame_size = packet->data_size / xmv->video.frame_count;
361 18 packet->frame_size -= packet->frame_size % packet->block_align;
362 }
363
364 /* Packet data offsets */
365
366 18 data_offset = avio_tell(pb);
367
368 18 xmv->video.data_offset = data_offset;
369 18 data_offset += xmv->video.data_size;
370
371
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 36 for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
372 18 xmv->audio[audio_track].data_offset = data_offset;
373 18 data_offset += xmv->audio[audio_track].data_size;
374 }
375
376 /* Video frames header */
377
378 /* Read new video extra data */
379
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 18 if (xmv->video.data_size > 0) {
380
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 18 if (xmv->video.has_extradata) {
381 1 xmv_read_extradata(xmv->video.extradata, pb);
382
383 1 xmv->video.data_size -= 4;
384 1 xmv->video.data_offset += 4;
385
386
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 1 if (xmv->video.stream_index >= 0) {
387 1 AVStream *vst = s->streams[xmv->video.stream_index];
388
389
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 1 av_assert0(xmv->video.stream_index < s->nb_streams);
390
391
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 1 if (vst->codecpar->extradata_size < 4) {
392
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 1 if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0)
393 ✗ return ret;
394 }
395
396 1 memcpy(vst->codecpar->extradata, xmv->video.extradata, 4);
397 }
398 }
399 }
400
401 18 return 0;
402 }
403
404 19 static int xmv_fetch_new_packet(AVFormatContext *s)
405 {
406 19 XMVDemuxContext *xmv = s->priv_data;
407 19 AVIOContext *pb = s->pb;
408 int result;
409
410
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 19 if (xmv->next_packet_size == 0)
411 1 return AVERROR_EOF;
412
413 /* Seek to it */
414 18 xmv->this_packet_offset = xmv->next_packet_offset;
415
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 18 if (avio_seek(pb, xmv->this_packet_offset, SEEK_SET) != xmv->this_packet_offset)
416 ✗ return AVERROR_INVALIDDATA;
417
418 /* Update the size */
419 18 xmv->this_packet_size = xmv->next_packet_size;
420
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 18 if (xmv->this_packet_size < (12 + xmv->audio_track_count * 4))
421 ✗ return AVERROR_INVALIDDATA;
422
423 /* Process the header */
424 18 result = xmv_process_packet_header(s);
425
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 18 if (result)
426 ✗ return result;
427
428 /* Update the offset */
429 18 xmv->next_packet_offset = xmv->this_packet_offset + xmv->this_packet_size;
430
431 18 return 0;
432 }
433
434 91 static int xmv_fetch_audio_packet(AVFormatContext *s,
435 AVPacket *pkt, uint32_t stream)
436 {
437 91 XMVDemuxContext *xmv = s->priv_data;
438 91 AVIOContext *pb = s->pb;
439 91 XMVAudioPacket *audio = &xmv->audio[stream];
440
441 uint32_t data_size;
442 int result;
443
444 /* Seek to it */
445
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 91 if (avio_seek(pb, audio->data_offset, SEEK_SET) != audio->data_offset)
446 ✗ return AVERROR_INVALIDDATA;
447
448
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 91 if ((xmv->video.current_frame + 1) < xmv->video.frame_count)
449 /* Not the last frame, get at most frame_size bytes. */
450 73 data_size = FFMIN(audio->frame_size, audio->data_size);
451 else
452 /* Last frame, get the rest. */
453 18 data_size = audio->data_size;
454
455 /* Read the packet */
456 91 result = av_get_packet(pb, pkt, data_size);
457
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 91 if (result <= 0)
458 ✗ return result;
459
460 91 pkt->stream_index = audio->stream_index;
461
462 /* Advance offset */
463 91 audio->data_size -= data_size;
464 91 audio->data_offset += data_size;
465
466 91 return 0;
467 }
468
469 90 static int xmv_fetch_video_packet(AVFormatContext *s,
470 AVPacket *pkt)
471 {
472 90 XMVDemuxContext *xmv = s->priv_data;
473 90 AVIOContext *pb = s->pb;
474 90 XMVVideoPacket *video = &xmv->video;
475
476 int result;
477 uint32_t frame_header;
478 uint32_t frame_size, frame_timestamp;
479 uint8_t *data, *end;
480
481 /* Seek to it */
482
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 90 if (avio_seek(pb, video->data_offset, SEEK_SET) != video->data_offset)
483 ✗ return AVERROR_INVALIDDATA;
484
485 /* Read the frame header */
486 90 frame_header = avio_rl32(pb);
487
488 90 frame_size = (frame_header & 0x1FFFF) * 4 + 4;
489 90 frame_timestamp = (frame_header >> 17);
490
491
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 90 if ((frame_size + 4) > video->data_size)
492 ✗ return AVERROR_INVALIDDATA;
493
494 /* Get the packet data */
495 90 result = av_get_packet(pb, pkt, frame_size);
496
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 90 if (result != frame_size)
497 ✗ return result;
498
499 /* Contrary to normal WMV2 video, the bit stream in XMV's
500 * WMV2 is little-endian.
501 * TODO: This manual swap is of course suboptimal.
502 */
503
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 135215 for (data = pkt->data, end = pkt->data + frame_size; data < end; data += 4)
504 135125 AV_WB32(data, AV_RL32(data));
505
506 90 pkt->stream_index = video->stream_index;
507
508 /* Calculate the PTS */
509
510 90 video->last_pts = frame_timestamp + video->pts;
511
512 90 pkt->duration = 0;
513 90 pkt->pts = video->last_pts;
514 90 pkt->dts = AV_NOPTS_VALUE;
515
516 90 video->pts += frame_timestamp;
517
518 /* Keyframe? */
519 90 pkt->flags = (pkt->data[0] & 0x80) ? 0 : AV_PKT_FLAG_KEY;
520
521 /* Advance offset */
522 90 video->data_size -= frame_size + 4;
523 90 video->data_offset += frame_size + 4;
524
525 90 return 0;
526 }
527
528 182 static int xmv_read_packet(AVFormatContext *s,
529 AVPacket *pkt)
530 {
531 182 XMVDemuxContext *xmv = s->priv_data;
532 int result;
533
534
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 182 if (xmv->video.current_frame == xmv->video.frame_count) {
535 /* No frames left in this packet, so we fetch a new one */
536
537 19 result = xmv_fetch_new_packet(s);
538
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 19 if (result)
539 1 return result;
540 }
541
542
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 181 if (xmv->current_stream == 0) {
543 /* Fetch a video frame */
544
545 90 result = xmv_fetch_video_packet(s, pkt);
546 } else {
547 /* Fetch an audio frame */
548
549 91 result = xmv_fetch_audio_packet(s, pkt, xmv->current_stream - 1);
550 }
551
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 181 if (result) {
552 ✗ xmv->current_stream = 0;
553 ✗ xmv->video.current_frame = xmv->video.frame_count;
554 ✗ return result;
555 }
556
557
558 /* Increase our counters */
559
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 181 if (++xmv->current_stream >= xmv->stream_count) {
560 91 xmv->current_stream = 0;
561 91 xmv->video.current_frame += 1;
562 }
563
564 181 return 0;
565 }
566
567 const FFInputFormat ff_xmv_demuxer = {
568 .p.name = "xmv",
569 .p.long_name = NULL_IF_CONFIG_SMALL("Microsoft XMV"),
570 .p.extensions = "xmv",
571 .priv_data_size = sizeof(XMVDemuxContext),
572 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
573 .read_probe = xmv_probe,
574 .read_header = xmv_read_header,
575 .read_packet = xmv_read_packet,
576 .read_close = xmv_read_close,
577 };
578