FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/xwma.c
Date: 2026-04-22 13:46:37
Exec Total Coverage
Lines: 87 140 62.1%
Functions: 3 3 100.0%
Branches: 44 106 41.5%
Line Branch Exec Source
1 /*
2 * xWMA demuxer
3 * Copyright (c) 2011 Max Horn
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <inttypes.h>
23 #include <stdint.h>
24
25 #include "libavutil/mem.h"
26 #include "avformat.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "riff.h"
30
31 /*
32 * Demuxer for xWMA, a Microsoft audio container used by XAudio 2.
33 */
34
35 typedef struct XWMAContext {
36 int64_t data_end;
37 } XWMAContext;
38
39 7467 static int xwma_probe(const AVProbeData *p)
40 {
41
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 7467 if (!memcmp(p->buf, "RIFF", 4) && !memcmp(p->buf + 8, "XWMA", 4))
42 1 return AVPROBE_SCORE_MAX;
43 7466 return 0;
44 }
45
46 1 static int xwma_read_header(AVFormatContext *s)
47 {
48 int64_t size;
49 1 int ret = 0;
50 1 uint32_t dpds_table_size = 0;
51 1 uint32_t *dpds_table = NULL;
52 unsigned int tag;
53 1 AVIOContext *pb = s->pb;
54 AVStream *st;
55 1 XWMAContext *xwma = s->priv_data;
56 int i;
57
58 /* The following code is mostly copied from wav.c, with some
59 * minor alterations.
60 */
61
62 /* check RIFF header */
63 1 tag = avio_rl32(pb);
64
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 1 if (tag != MKTAG('R', 'I', 'F', 'F'))
65 ✗ return AVERROR_INVALIDDATA;
66 1 avio_rl32(pb); /* file size */
67 1 tag = avio_rl32(pb);
68
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 1 if (tag != MKTAG('X', 'W', 'M', 'A'))
69 ✗ return AVERROR_INVALIDDATA;
70
71 /* parse fmt header */
72 1 tag = avio_rl32(pb);
73
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 1 if (tag != MKTAG('f', 'm', 't', ' '))
74 ✗ return AVERROR_INVALIDDATA;
75 1 size = avio_rl32(pb);
76 1 st = avformat_new_stream(s, NULL);
77
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 1 if (!st)
78 ✗ return AVERROR(ENOMEM);
79
80 1 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
81
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 1 if (ret < 0)
82 ✗ return ret;
83 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_NONE;
84
85 /* XWMA encoder only allows a few channel/sample rate/bitrate combinations,
86 * but some create identical files with fake bitrate (1ch 22050hz at
87 * 20/48/192kbps are all 20kbps, with the exact same codec data).
88 * Decoder needs correct bitrate to work, so it's normalized here. */
89
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 1 if (st->codecpar->codec_id == AV_CODEC_ID_WMAV2) {
90 1 int ch = st->codecpar->ch_layout.nb_channels;
91 1 int sr = st->codecpar->sample_rate;
92 1 int br = st->codecpar->bit_rate;
93
94
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 1 if (ch == 1) {
95 ✗ if (sr == 22050 && (br==48000 || br==192000))
96 ✗ br = 20000;
97 ✗ else if (sr == 32000 && (br==48000 || br==192000))
98 ✗ br = 20000;
99 ✗ else if (sr == 44100 && (br==96000 || br==192000))
100 ✗ br = 48000;
101 }
102
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 1 else if (ch == 2) {
103
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 1 if (sr == 22050 && (br==48000 || br==192000))
104 ✗ br = 32000;
105
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 1 else if (sr == 32000 && (br==192000))
106 ✗ br = 48000;
107 }
108
109 1 st->codecpar->bit_rate = br;
110 }
111
112 /* Normally xWMA can only contain WMAv2 with 1/2 channels,
113 * and WMAPRO with 6 channels. */
114
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 1 if (st->codecpar->codec_id != AV_CODEC_ID_WMAV2 &&
115 ✗ st->codecpar->codec_id != AV_CODEC_ID_WMAPRO) {
116 ✗ avpriv_request_sample(s, "Unexpected codec (tag %s; id %d)",
117 ✗ av_fourcc2str(st->codecpar->codec_tag),
118 ✗ st->codecpar->codec_id);
119 } else {
120 /* xWMA shouldn't have extradata. But the WMA codecs require it,
121 * so we provide our own fake extradata.
122 *
123 * First, check that there really was no extradata in the header. If
124 * there was, then try to use it, after asking the user to provide a
125 * sample of this unusual file.
126 */
127
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 1 if (st->codecpar->extradata_size != 0) {
128 /* Surprise, surprise: We *did* get some extradata. No idea
129 * if it will work, but just go on and try it, after asking
130 * the user for a sample.
131 */
132 ✗ avpriv_request_sample(s, "Unexpected extradata (%d bytes)",
133 ✗ st->codecpar->extradata_size);
134
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 1 } else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
135 ✗ if ((ret = ff_alloc_extradata(st->codecpar, 18)) < 0)
136 ✗ return ret;
137
138 ✗ memset(st->codecpar->extradata, 0, st->codecpar->extradata_size);
139 ✗ st->codecpar->extradata[ 0] = st->codecpar->bits_per_coded_sample;
140 ✗ st->codecpar->extradata[14] = 224;
141 } else {
142
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 1 if ((ret = ff_alloc_extradata(st->codecpar, 6)) < 0)
143 ✗ return ret;
144
145 1 memset(st->codecpar->extradata, 0, st->codecpar->extradata_size);
146 /* setup extradata with our experimentally obtained value */
147 1 st->codecpar->extradata[4] = 31;
148 }
149 }
150
151
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 1 if (!av_channel_layout_check(&st->codecpar->ch_layout)) {
152 ✗ av_log(s, AV_LOG_WARNING, "Invalid channel count: %d\n",
153 ✗ st->codecpar->ch_layout.nb_channels);
154 ✗ return AVERROR_INVALIDDATA;
155 }
156
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 1 if (!st->codecpar->bits_per_coded_sample || st->codecpar->bits_per_coded_sample > 64) {
157 ✗ av_log(s, AV_LOG_WARNING, "Invalid bits_per_coded_sample: %d\n",
158 ✗ st->codecpar->bits_per_coded_sample);
159 ✗ return AVERROR_INVALIDDATA;
160 }
161
162 /* set the sample rate */
163 1 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
164
165 /* parse the remaining RIFF chunks */
166 for (;;) {
167
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 2 if (pb->eof_reached) {
168 ✗ ret = AVERROR_EOF;
169 ✗ goto fail;
170 }
171 /* read next chunk tag */
172 2 tag = avio_rl32(pb);
173 2 size = avio_rl32(pb);
174
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 2 if (tag == MKTAG('d', 'a', 't', 'a')) {
175 /* We assume that the data chunk comes last. */
176 1 break;
177
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 1 } else if (tag == MKTAG('d','p','d','s')) {
178 /* Quoting the MSDN xWMA docs on the dpds chunk: "Contains the
179 * decoded packet cumulative data size array, each element is the
180 * number of bytes accumulated after the corresponding xWMA packet
181 * is decoded in order."
182 *
183 * Each packet has size equal to st->codecpar->block_align, which in
184 * all cases I saw so far was always 2230. Thus, we can use the
185 * dpds data to compute a seeking index.
186 */
187
188 /* Error out if there is more than one dpds chunk. */
189
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 1 if (dpds_table) {
190 ✗ av_log(s, AV_LOG_ERROR, "two dpds chunks present\n");
191 ✗ ret = AVERROR_INVALIDDATA;
192 ✗ goto fail;
193 }
194
195 /* Compute the number of entries in the dpds chunk. */
196
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 1 if (size & 3) { /* Size should be divisible by four */
197 ✗ av_log(s, AV_LOG_WARNING,
198 "dpds chunk size %"PRId64" not divisible by 4\n", size);
199 }
200 1 dpds_table_size = size / 4;
201
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 1 if (dpds_table_size == 0 || dpds_table_size >= INT_MAX / 4) {
202 ✗ av_log(s, AV_LOG_ERROR,
203 "dpds chunk size %"PRId64" invalid\n", size);
204 ✗ return AVERROR_INVALIDDATA;
205 }
206
207 /* Allocate some temporary storage to keep the dpds data around.
208 * for processing later on.
209 */
210 1 dpds_table = av_malloc_array(dpds_table_size, sizeof(uint32_t));
211
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 1 if (!dpds_table) {
212 ✗ return AVERROR(ENOMEM);
213 }
214
215
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 159 for (i = 0; i < dpds_table_size; ++i) {
216
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 158 if (avio_feof(pb)) {
217 ✗ ret = AVERROR_INVALIDDATA;
218 ✗ goto fail;
219 }
220 158 dpds_table[i] = avio_rl32(pb);
221 158 size -= 4;
222 }
223 }
224 1 avio_skip(pb, size);
225 }
226
227 /* Determine overall data length */
228
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 1 if (size < 0) {
229 ✗ ret = AVERROR_INVALIDDATA;
230 ✗ goto fail;
231 }
232
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 1 if (!size) {
233 ✗ xwma->data_end = INT64_MAX;
234 } else
235 1 xwma->data_end = avio_tell(pb) + size;
236
237
238
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 2 if (dpds_table && dpds_table_size) {
239 int64_t cur_pos;
240 1 const uint32_t bytes_per_sample
241 1 = (st->codecpar->ch_layout.nb_channels * st->codecpar->bits_per_coded_sample) >> 3;
242
243 /* Estimate the duration from the total number of output bytes. */
244 1 const uint64_t total_decoded_bytes = dpds_table[dpds_table_size - 1];
245
246
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 1 if (!bytes_per_sample) {
247 ✗ av_log(s, AV_LOG_ERROR,
248 "Invalid bits_per_coded_sample %d for %d channels\n",
249 ✗ st->codecpar->bits_per_coded_sample, st->codecpar->ch_layout.nb_channels);
250 ✗ ret = AVERROR_INVALIDDATA;
251 ✗ goto fail;
252 }
253
254 1 st->duration = total_decoded_bytes / bytes_per_sample;
255
256 /* Use the dpds data to build a seek table. We can only do this after
257 * we know the offset to the data chunk, as we need that to determine
258 * the actual offset to each input block.
259 * Note: If we allowed ourselves to assume that the data chunk always
260 * follows immediately after the dpds block, we could of course guess
261 * the data block's start offset already while reading the dpds chunk.
262 * I decided against that, just in case other chunks ever are
263 * discovered.
264 */
265 1 cur_pos = avio_tell(pb);
266
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 159 for (i = 0; i < dpds_table_size; ++i) {
267 /* From the number of output bytes that would accumulate in the
268 * output buffer after decoding the first (i+1) packets, we compute
269 * an offset / timestamp pair.
270 */
271 158 av_add_index_entry(st,
272 158 cur_pos + (i+1) * st->codecpar->block_align, /* pos */
273 158 dpds_table[i] / bytes_per_sample, /* timestamp */
274 158 st->codecpar->block_align, /* size */
275 0, /* duration */
276 AVINDEX_KEYFRAME);
277 }
278 ✗ } else if (st->codecpar->bit_rate) {
279 /* No dpds chunk was present (or only an empty one), so estimate
280 * the total duration using the average bits per sample and the
281 * total data length.
282 */
283 ✗ st->duration = av_rescale((size<<3), st->codecpar->sample_rate, st->codecpar->bit_rate);
284 }
285
286 ✗ fail:
287 1 av_free(dpds_table);
288
289 1 return ret;
290 }
291
292 159 static int xwma_read_packet(AVFormatContext *s, AVPacket *pkt)
293 {
294 int ret, size;
295 int64_t left;
296 AVStream *st;
297 159 XWMAContext *xwma = s->priv_data;
298
299 159 st = s->streams[0];
300
301 159 left = xwma->data_end - avio_tell(s->pb);
302
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 159 if (left <= 0) {
303 1 return AVERROR_EOF;
304 }
305
306 /* read a single block; the default block size is 2230. */
307
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 158 size = (st->codecpar->block_align > 1) ? st->codecpar->block_align : 2230;
308 158 size = FFMIN(size, left);
309
310 158 ret = av_get_packet(s->pb, pkt, size);
311
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 158 if (ret < 0)
312 ✗ return ret;
313
314 158 pkt->stream_index = 0;
315 158 return ret;
316 }
317
318 const FFInputFormat ff_xwma_demuxer = {
319 .p.name = "xwma",
320 .p.long_name = NULL_IF_CONFIG_SMALL("Microsoft xWMA"),
321 .priv_data_size = sizeof(XWMAContext),
322 .read_probe = xwma_probe,
323 .read_header = xwma_read_header,
324 .read_packet = xwma_read_packet,
325 };
326