aeb2fae46626172de32c0f043d5080021a58cc76
[libav.git] / libavformat / nuv.c
1 /*
2 * NuppelVideo demuxer.
3 * Copyright (c) 2006 Reimar Doeffinger
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "riff.h"
29
30 static const AVCodecTag nuv_audio_tags[] = {
31 { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
32 { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
33 { AV_CODEC_ID_NONE, 0 },
34 };
35
36 typedef struct NUVContext {
37 int v_id;
38 int a_id;
39 int rtjpg_video;
40 } NUVContext;
41
42 typedef enum {
43 NUV_VIDEO = 'V',
44 NUV_EXTRADATA = 'D',
45 NUV_AUDIO = 'A',
46 NUV_SEEKP = 'R',
47 NUV_MYTHEXT = 'X'
48 } nuv_frametype;
49
50 static int nuv_probe(AVProbeData *p)
51 {
52 if (!memcmp(p->buf, "NuppelVideo", 12))
53 return AVPROBE_SCORE_MAX;
54 if (!memcmp(p->buf, "MythTVVideo", 12))
55 return AVPROBE_SCORE_MAX;
56 return 0;
57 }
58
59 /// little macro to sanitize packet size
60 #define PKTSIZE(s) (s & 0xffffff)
61
62 /**
63 * @brief read until we found all data needed for decoding
64 * @param vst video stream of which to change parameters
65 * @param ast video stream of which to change parameters
66 * @param myth set if this is a MythTVVideo format file
67 * @return 0 or AVERROR code
68 */
69 static int get_codec_data(AVIOContext *pb, AVStream *vst,
70 AVStream *ast, int myth)
71 {
72 nuv_frametype frametype;
73
74 if (!vst && !myth)
75 return 1; // no codec data needed
76 while (!pb->eof_reached) {
77 int size, subtype;
78
79 frametype = avio_r8(pb);
80 switch (frametype) {
81 case NUV_EXTRADATA:
82 subtype = avio_r8(pb);
83 avio_skip(pb, 6);
84 size = PKTSIZE(avio_rl32(pb));
85 if (vst && subtype == 'R') {
86 if (vst->codec->extradata) {
87 av_freep(&vst->codec->extradata);
88 vst->codec->extradata_size = 0;
89 }
90 vst->codec->extradata = av_malloc(size);
91 if (!vst->codec->extradata)
92 return AVERROR(ENOMEM);
93 vst->codec->extradata_size = size;
94 avio_read(pb, vst->codec->extradata, size);
95 size = 0;
96 if (!myth)
97 return 0;
98 }
99 break;
100 case NUV_MYTHEXT:
101 avio_skip(pb, 7);
102 size = PKTSIZE(avio_rl32(pb));
103 if (size != 128 * 4)
104 break;
105 avio_rl32(pb); // version
106 if (vst) {
107 vst->codec->codec_tag = avio_rl32(pb);
108 vst->codec->codec_id =
109 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
110 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
111 vst->codec->codec_id = AV_CODEC_ID_NUV;
112 } else
113 avio_skip(pb, 4);
114
115 if (ast) {
116 int id;
117
118 ast->codec->codec_tag = avio_rl32(pb);
119 ast->codec->sample_rate = avio_rl32(pb);
120 ast->codec->bits_per_coded_sample = avio_rl32(pb);
121 ast->codec->channels = avio_rl32(pb);
122 ast->codec->channel_layout = 0;
123
124 id = ff_wav_codec_get_id(ast->codec->codec_tag,
125 ast->codec->bits_per_coded_sample);
126 if (id == AV_CODEC_ID_NONE) {
127 id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
128 if (id == AV_CODEC_ID_PCM_S16LE)
129 id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample,
130 0, 0, ~1);
131 }
132 ast->codec->codec_id = id;
133
134 ast->need_parsing = AVSTREAM_PARSE_FULL;
135 } else
136 avio_skip(pb, 4 * 4);
137
138 size -= 6 * 4;
139 avio_skip(pb, size);
140 return 0;
141 case NUV_SEEKP:
142 size = 11;
143 break;
144 default:
145 avio_skip(pb, 7);
146 size = PKTSIZE(avio_rl32(pb));
147 break;
148 }
149 avio_skip(pb, size);
150 }
151
152 return 0;
153 }
154
155 static int nuv_header(AVFormatContext *s)
156 {
157 NUVContext *ctx = s->priv_data;
158 AVIOContext *pb = s->pb;
159 char id_string[12];
160 double aspect, fps;
161 int is_mythtv, width, height, v_packs, a_packs, ret;
162 AVStream *vst = NULL, *ast = NULL;
163
164 avio_read(pb, id_string, 12);
165 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
166 avio_skip(pb, 5); // version string
167 avio_skip(pb, 3); // padding
168 width = avio_rl32(pb);
169 height = avio_rl32(pb);
170 avio_rl32(pb); // unused, "desiredwidth"
171 avio_rl32(pb); // unused, "desiredheight"
172 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
173 avio_skip(pb, 3); // padding
174 aspect = av_int2double(avio_rl64(pb));
175 if (aspect > 0.9999 && aspect < 1.0001)
176 aspect = 4.0 / 3.0;
177 fps = av_int2double(avio_rl64(pb));
178
179 // number of packets per stream type, -1 means unknown, e.g. streaming
180 v_packs = avio_rl32(pb);
181 a_packs = avio_rl32(pb);
182 avio_rl32(pb); // text
183
184 avio_rl32(pb); // keyframe distance (?)
185
186 if (v_packs) {
187 vst = avformat_new_stream(s, NULL);
188 if (!vst)
189 return AVERROR(ENOMEM);
190 ctx->v_id = vst->index;
191
192 ret = av_image_check_size(width, height, 0, ctx);
193 if (ret < 0)
194 return ret;
195
196 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
197 vst->codec->codec_id = AV_CODEC_ID_NUV;
198 vst->codec->width = width;
199 vst->codec->height = height;
200 vst->codec->bits_per_coded_sample = 10;
201 vst->sample_aspect_ratio = av_d2q(aspect * height / width,
202 10000);
203 vst->avg_frame_rate = av_d2q(fps, 60000);
204 avpriv_set_pts_info(vst, 32, 1, 1000);
205 } else
206 ctx->v_id = -1;
207
208 if (a_packs) {
209 ast = avformat_new_stream(s, NULL);
210 if (!ast)
211 return AVERROR(ENOMEM);
212 ctx->a_id = ast->index;
213
214 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
215 ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
216 ast->codec->channels = 2;
217 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
218 ast->codec->sample_rate = 44100;
219 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
220 ast->codec->block_align = 2 * 2;
221 ast->codec->bits_per_coded_sample = 16;
222 avpriv_set_pts_info(ast, 32, 1, 1000);
223 } else
224 ctx->a_id = -1;
225
226 if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
227 return ret;
228
229 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
230
231 return 0;
232 }
233
234 #define HDRSIZE 12
235
236 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
237 {
238 NUVContext *ctx = s->priv_data;
239 AVIOContext *pb = s->pb;
240 uint8_t hdr[HDRSIZE];
241 nuv_frametype frametype;
242 int ret, size;
243
244 while (!pb->eof_reached) {
245 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
246 uint64_t pos = avio_tell(pb);
247
248 ret = avio_read(pb, hdr, HDRSIZE);
249 if (ret < HDRSIZE)
250 return ret < 0 ? ret : AVERROR(EIO);
251
252 frametype = hdr[0];
253 size = PKTSIZE(AV_RL32(&hdr[8]));
254
255 switch (frametype) {
256 case NUV_EXTRADATA:
257 if (!ctx->rtjpg_video) {
258 avio_skip(pb, size);
259 break;
260 }
261 case NUV_VIDEO:
262 if (ctx->v_id < 0) {
263 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
264 avio_skip(pb, size);
265 break;
266 }
267 ret = av_new_packet(pkt, copyhdrsize + size);
268 if (ret < 0)
269 return ret;
270 // HACK: we have no idea if it is a keyframe,
271 // but if we mark none seeking will not work at all.
272 pkt->flags |= AV_PKT_FLAG_KEY;
273 pkt->pos = pos;
274 pkt->pts = AV_RL32(&hdr[4]);
275 pkt->stream_index = ctx->v_id;
276 memcpy(pkt->data, hdr, copyhdrsize);
277 ret = avio_read(pb, pkt->data + copyhdrsize, size);
278 if (ret < 0) {
279 av_packet_unref(pkt);
280 return ret;
281 }
282 if (ret < size)
283 av_shrink_packet(pkt, copyhdrsize + ret);
284 return 0;
285 case NUV_AUDIO:
286 if (ctx->a_id < 0) {
287 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
288 avio_skip(pb, size);
289 break;
290 }
291 ret = av_get_packet(pb, pkt, size);
292 pkt->flags |= AV_PKT_FLAG_KEY;
293 pkt->pos = pos;
294 pkt->pts = AV_RL32(&hdr[4]);
295 pkt->stream_index = ctx->a_id;
296 if (ret < 0)
297 return ret;
298 return 0;
299 case NUV_SEEKP:
300 // contains no data, size value is invalid
301 break;
302 default:
303 avio_skip(pb, size);
304 break;
305 }
306 }
307
308 return AVERROR(EIO);
309 }
310
311 AVInputFormat ff_nuv_demuxer = {
312 .name = "nuv",
313 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
314 .priv_data_size = sizeof(NUVContext),
315 .read_probe = nuv_probe,
316 .read_header = nuv_header,
317 .read_packet = nuv_packet,
318 .flags = AVFMT_GENERIC_INDEX,
319 };