FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/rl2.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 108 142 76.1%
Functions: 3 4 75.0%
Branches: 42 70 60.0%
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1 /*
2 * RL2 Format Demuxer
3 * Copyright (c) 2008 Sascha Sommer (saschasommer@freenet.de)
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 /**
23 * RL2 file demuxer
24 * @file
25 * @author Sascha Sommer (saschasommer@freenet.de)
26 * @see http://wiki.multimedia.cx/index.php?title=RL2
27 *
28 * extradata:
29 * 2 byte le initial drawing offset within 320x200 viewport
30 * 4 byte le number of used colors
31 * 256 * 3 bytes rgb palette
32 * optional background_frame
33 */
34
35 #include <stdint.h>
36
37 #include "libavutil/intreadwrite.h"
38 #include "libavutil/mathematics.h"
39 #include "libavutil/mem.h"
40 #include "avformat.h"
41 #include "demux.h"
42 #include "internal.h"
43
44 #define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr, palette
45
46 #define FORM_TAG MKBETAG('F', 'O', 'R', 'M')
47 #define RLV2_TAG MKBETAG('R', 'L', 'V', '2')
48 #define RLV3_TAG MKBETAG('R', 'L', 'V', '3')
49
50 typedef struct Rl2DemuxContext {
51 unsigned int index_pos[2]; ///< indexes in the sample tables
52 } Rl2DemuxContext;
53
54
55 /**
56 * check if the file is in rl2 format
57 * @param p probe buffer
58 * @return 0 when the probe buffer does not contain rl2 data, > 0 otherwise
59 */
60 7186 static int rl2_probe(const AVProbeData *p)
61 {
62
63
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 7186 if(AV_RB32(&p->buf[0]) != FORM_TAG)
64 7165 return 0;
65
66
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 21 if(AV_RB32(&p->buf[8]) != RLV2_TAG &&
67
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 21 AV_RB32(&p->buf[8]) != RLV3_TAG)
68 20 return 0;
69
70 1 return AVPROBE_SCORE_MAX;
71 }
72
73 /**
74 * read rl2 header data and setup the avstreams
75 * @param s demuxer context
76 * @return 0 on success, AVERROR otherwise
77 */
78 1 static av_cold int rl2_read_header(AVFormatContext *s)
79 {
80 1 AVIOContext *pb = s->pb;
81 AVStream *st;
82 unsigned int frame_count;
83 1 unsigned int audio_frame_counter = 0;
84 1 unsigned int video_frame_counter = 0;
85 unsigned int back_size;
86 unsigned short sound_rate;
87 unsigned short rate;
88 unsigned short channels;
89 unsigned short def_sound_size;
90 unsigned int signature;
91 1 unsigned int pts_den = 11025; /* video only case */
92 1 unsigned int pts_num = 1103;
93 1 unsigned int* chunk_offset = NULL;
94 1 int* chunk_size = NULL;
95 1 int* audio_size = NULL;
96 int i;
97 1 int ret = 0;
98
99 1 avio_skip(pb,4); /* skip FORM tag */
100 1 back_size = avio_rl32(pb); /**< get size of the background frame */
101 1 signature = avio_rb32(pb);
102 1 avio_skip(pb, 4); /* data size */
103 1 frame_count = avio_rl32(pb);
104
105 /* disallow back_sizes and frame_counts that may lead to overflows later */
106
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 1 if(back_size > INT_MAX/2 || frame_count > INT_MAX / sizeof(uint32_t))
107 ✗ return AVERROR_INVALIDDATA;
108
109 1 avio_skip(pb, 2); /* encoding method */
110 1 sound_rate = avio_rl16(pb);
111 1 rate = avio_rl16(pb);
112 1 channels = avio_rl16(pb);
113 1 def_sound_size = avio_rl16(pb);
114
115 /** setup video stream */
116 1 st = avformat_new_stream(s, NULL);
117
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 1 if(!st)
118 ✗ return AVERROR(ENOMEM);
119
120 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
121 1 st->codecpar->codec_id = AV_CODEC_ID_RL2;
122 1 st->codecpar->codec_tag = 0; /* no fourcc */
123 1 st->codecpar->width = 320;
124 1 st->codecpar->height = 200;
125
126 /** allocate and fill extradata */
127 1 st->codecpar->extradata_size = EXTRADATA1_SIZE;
128
129
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 1 if(signature == RLV3_TAG && back_size > 0)
130 1 st->codecpar->extradata_size += back_size;
131
132 1 ret = ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size);
133
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 1 if (ret < 0)
134 ✗ return ret;
135
136 /** setup audio stream if present */
137
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 1 if(sound_rate){
138
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 1 if (!channels || channels > 42) {
139 ✗ av_log(s, AV_LOG_ERROR, "Invalid number of channels: %d\n", channels);
140 ✗ return AVERROR_INVALIDDATA;
141 }
142
143 1 pts_num = def_sound_size;
144 1 pts_den = rate;
145
146 1 st = avformat_new_stream(s, NULL);
147
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 1 if (!st)
148 ✗ return AVERROR(ENOMEM);
149 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
150 1 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
151 1 st->codecpar->codec_tag = 1;
152 1 st->codecpar->ch_layout.nb_channels = channels;
153 1 st->codecpar->bits_per_coded_sample = 8;
154 1 st->codecpar->sample_rate = rate;
155 1 st->codecpar->bit_rate = channels * st->codecpar->sample_rate *
156 1 st->codecpar->bits_per_coded_sample;
157 1 st->codecpar->block_align = channels *
158 1 st->codecpar->bits_per_coded_sample / 8;
159 1 avpriv_set_pts_info(st,32,1,rate);
160 }
161
162 1 avpriv_set_pts_info(s->streams[0], 32, pts_num, pts_den);
163
164 1 chunk_size = av_malloc(frame_count * sizeof(uint32_t));
165 1 audio_size = av_malloc(frame_count * sizeof(uint32_t));
166 1 chunk_offset = av_malloc(frame_count * sizeof(uint32_t));
167
168
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 1 if(!chunk_size || !audio_size || !chunk_offset){
169 ✗ av_free(chunk_size);
170 ✗ av_free(audio_size);
171 ✗ av_free(chunk_offset);
172 ✗ return AVERROR(ENOMEM);
173 }
174
175 /** read offset and size tables */
176
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 109 for(i=0; i < frame_count;i++) {
177
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 108 if (avio_feof(pb)) {
178 ✗ ret = AVERROR_INVALIDDATA;
179 ✗ goto end;
180 }
181 108 chunk_size[i] = avio_rl32(pb);
182 }
183
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 109 for(i=0; i < frame_count;i++) {
184
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 108 if (avio_feof(pb)) {
185 ✗ ret = AVERROR_INVALIDDATA;
186 ✗ goto end;
187 }
188 108 chunk_offset[i] = avio_rl32(pb);
189 }
190
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 109 for(i=0; i < frame_count;i++) {
191
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 108 if (avio_feof(pb)) {
192 ✗ ret = AVERROR_INVALIDDATA;
193 ✗ goto end;
194 }
195 108 audio_size[i] = avio_rl32(pb) & 0xFFFF;
196 }
197
198 /** build the sample index */
199
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 109 for(i=0;i<frame_count;i++){
200
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 108 if(chunk_size[i] < 0 || audio_size[i] > chunk_size[i]){
201 ✗ ret = AVERROR_INVALIDDATA;
202 ✗ break;
203 }
204
205
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 108 if(sound_rate && audio_size[i]){
206 108 av_add_index_entry(s->streams[1], chunk_offset[i],
207 108 audio_frame_counter,audio_size[i], 0, AVINDEX_KEYFRAME);
208 108 audio_frame_counter += audio_size[i] / channels;
209 }
210 108 av_add_index_entry(s->streams[0], chunk_offset[i] + audio_size[i],
211 108 video_frame_counter,chunk_size[i]-audio_size[i],0,AVINDEX_KEYFRAME);
212 108 ++video_frame_counter;
213 }
214
215 1 end:
216 1 av_free(chunk_size);
217 1 av_free(audio_size);
218 1 av_free(chunk_offset);
219
220 1 return ret;
221 }
222
223 /**
224 * read a single audio or video packet
225 * @param s demuxer context
226 * @param pkt the packet to be filled
227 * @return 0 on success, AVERROR otherwise
228 */
229 217 static int rl2_read_packet(AVFormatContext *s,
230 AVPacket *pkt)
231 {
232 217 Rl2DemuxContext *rl2 = s->priv_data;
233 217 AVIOContext *pb = s->pb;
234 217 AVIndexEntry *sample = NULL;
235 int i;
236 217 int ret = 0;
237 217 int stream_id = -1;
238 217 int64_t pos = INT64_MAX;
239
240 /** check if there is a valid video or audio entry that can be used */
241
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 651 for(i=0; i<s->nb_streams; i++){
242 434 const FFStream *const sti = ffstream(s->streams[i]);
243
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 434 if (rl2->index_pos[i] < sti->nb_index_entries
244
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 431 && sti->index_entries[ rl2->index_pos[i] ].pos < pos) {
245 324 sample = &sti->index_entries[ rl2->index_pos[i] ];
246 324 pos= sample->pos;
247 324 stream_id= i;
248 }
249 }
250
251
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 217 if(stream_id == -1)
252 1 return AVERROR_EOF;
253
254 216 ++rl2->index_pos[stream_id];
255
256 /** position the stream (will probably be there anyway) */
257 216 avio_seek(pb, sample->pos, SEEK_SET);
258
259 /** fill the packet */
260 216 ret = av_get_packet(pb, pkt, sample->size);
261
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 216 if(ret != sample->size){
262 ✗ return AVERROR(EIO);
263 }
264
265 216 pkt->stream_index = stream_id;
266 216 pkt->pts = sample->timestamp;
267
268 216 return ret;
269 }
270
271 /**
272 * seek to a new timestamp
273 * @param s demuxer context
274 * @param stream_index index of the stream that should be seeked
275 * @param timestamp wanted timestamp
276 * @param flags direction and seeking mode
277 * @return 0 on success, -1 otherwise
278 */
279 ✗ static int rl2_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
280 {
281 ✗ AVStream *st = s->streams[stream_index];
282 ✗ Rl2DemuxContext *rl2 = s->priv_data;
283 int i;
284 ✗ int index = av_index_search_timestamp(st, timestamp, flags);
285 ✗ if(index < 0)
286 ✗ return -1;
287
288 ✗ rl2->index_pos[stream_index] = index;
289 ✗ timestamp = ffstream(st)->index_entries[index].timestamp;
290
291 ✗ for(i=0; i < s->nb_streams; i++){
292 ✗ AVStream *st2 = s->streams[i];
293 ✗ index = av_index_search_timestamp(st2,
294 av_rescale_q(timestamp, st->time_base, st2->time_base),
295 flags | AVSEEK_FLAG_BACKWARD);
296
297 ✗ if(index < 0)
298 ✗ index = 0;
299
300 ✗ rl2->index_pos[i] = index;
301 }
302
303 ✗ return 0;
304 }
305
306 const FFInputFormat ff_rl2_demuxer = {
307 .p.name = "rl2",
308 .p.long_name = NULL_IF_CONFIG_SMALL("RL2"),
309 .priv_data_size = sizeof(Rl2DemuxContext),
310 .read_probe = rl2_probe,
311 .read_header = rl2_read_header,
312 .read_packet = rl2_read_packet,
313 .read_seek = rl2_read_seek,
314 };
315