3 * Copyright (c) 2006 Reimar Doeffinger
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
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 },
36 typedef struct NUVContext {
50 static int nuv_probe(AVProbeData *p)
52 if (!memcmp(p->buf, "NuppelVideo", 12))
53 return AVPROBE_SCORE_MAX;
54 if (!memcmp(p->buf, "MythTVVideo", 12))
55 return AVPROBE_SCORE_MAX;
59 /// little macro to sanitize packet size
60 #define PKTSIZE(s) (s & 0xffffff)
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
69 static int get_codec_data(AVIOContext *pb, AVStream *vst,
70 AVStream *ast, int myth)
72 nuv_frametype frametype;
75 return 1; // no codec data needed
76 while (!avio_feof(pb)) {
79 frametype = avio_r8(pb);
82 subtype = avio_r8(pb);
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;
90 if (ff_get_extradata(vst->codec, pb, size) < 0)
91 return AVERROR(ENOMEM);
99 size = PKTSIZE(avio_rl32(pb));
102 avio_rl32(pb); // version
104 vst->codec->codec_tag = avio_rl32(pb);
105 vst->codec->codec_id =
106 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
107 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
108 vst->codec->codec_id = AV_CODEC_ID_NUV;
115 ast->codec->codec_tag = avio_rl32(pb);
116 ast->codec->sample_rate = avio_rl32(pb);
117 ast->codec->bits_per_coded_sample = avio_rl32(pb);
118 ast->codec->channels = avio_rl32(pb);
119 ast->codec->channel_layout = 0;
121 id = ff_wav_codec_get_id(ast->codec->codec_tag,
122 ast->codec->bits_per_coded_sample);
123 if (id == AV_CODEC_ID_NONE) {
124 id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
125 if (id == AV_CODEC_ID_PCM_S16LE)
126 id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample,
129 ast->codec->codec_id = id;
131 ast->need_parsing = AVSTREAM_PARSE_FULL;
133 avio_skip(pb, 4 * 4);
143 size = PKTSIZE(avio_rl32(pb));
152 static int nuv_header(AVFormatContext *s)
154 NUVContext *ctx = s->priv_data;
155 AVIOContext *pb = s->pb;
158 int is_mythtv, width, height, v_packs, a_packs, ret;
159 AVStream *vst = NULL, *ast = NULL;
161 avio_read(pb, id_string, 12);
162 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
163 avio_skip(pb, 5); // version string
164 avio_skip(pb, 3); // padding
165 width = avio_rl32(pb);
166 height = avio_rl32(pb);
167 avio_rl32(pb); // unused, "desiredwidth"
168 avio_rl32(pb); // unused, "desiredheight"
169 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
170 avio_skip(pb, 3); // padding
171 aspect = av_int2double(avio_rl64(pb));
172 if (aspect > 0.9999 && aspect < 1.0001)
174 fps = av_int2double(avio_rl64(pb));
176 // number of packets per stream type, -1 means unknown, e.g. streaming
177 v_packs = avio_rl32(pb);
178 a_packs = avio_rl32(pb);
179 avio_rl32(pb); // text
181 avio_rl32(pb); // keyframe distance (?)
184 vst = avformat_new_stream(s, NULL);
186 return AVERROR(ENOMEM);
187 ctx->v_id = vst->index;
189 ret = av_image_check_size(width, height, 0, ctx);
193 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
194 vst->codec->codec_id = AV_CODEC_ID_NUV;
195 vst->codec->width = width;
196 vst->codec->height = height;
197 vst->codec->bits_per_coded_sample = 10;
198 vst->sample_aspect_ratio = av_d2q(aspect * height / width,
200 #if FF_API_R_FRAME_RATE
203 vst->avg_frame_rate = av_d2q(fps, 60000);
204 avpriv_set_pts_info(vst, 32, 1, 1000);
209 ast = avformat_new_stream(s, NULL);
211 return AVERROR(ENOMEM);
212 ctx->a_id = ast->index;
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);
226 if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
229 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
236 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
238 NUVContext *ctx = s->priv_data;
239 AVIOContext *pb = s->pb;
240 uint8_t hdr[HDRSIZE];
241 nuv_frametype frametype;
244 while (!avio_feof(pb)) {
245 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
246 uint64_t pos = avio_tell(pb);
248 ret = avio_read(pb, hdr, HDRSIZE);
250 return ret < 0 ? ret : AVERROR(EIO);
253 size = PKTSIZE(AV_RL32(&hdr[8]));
257 if (!ctx->rtjpg_video) {
263 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
267 ret = av_new_packet(pkt, copyhdrsize + size);
272 pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
273 pkt->pts = AV_RL32(&hdr[4]);
274 pkt->stream_index = ctx->v_id;
275 memcpy(pkt->data, hdr, copyhdrsize);
276 ret = avio_read(pb, pkt->data + copyhdrsize, size);
282 av_shrink_packet(pkt, copyhdrsize + ret);
286 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
290 ret = av_get_packet(pb, pkt, size);
291 pkt->flags |= AV_PKT_FLAG_KEY;
293 pkt->pts = AV_RL32(&hdr[4]);
294 pkt->stream_index = ctx->a_id;
299 // contains no data, size value is invalid
311 * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
312 * \return 1 if the syncword is found 0 otherwise.
314 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
315 AVIOContext *pb = s->pb;
317 while(!avio_feof(pb) && avio_tell(pb) < pos_limit) {
318 tag = (tag << 8) | avio_r8(pb);
319 if (tag == MKBETAG('R','T','j','j') &&
320 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
321 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
328 * \brief attempts to read a timestamp from stream at the given stream position
329 * \return timestamp if successful and AV_NOPTS_VALUE if failure
331 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
332 int64_t *ppos, int64_t pos_limit)
334 NUVContext *ctx = s->priv_data;
335 AVIOContext *pb = s->pb;
336 uint8_t hdr[HDRSIZE];
337 nuv_frametype frametype;
341 if (avio_seek(pb, *ppos, SEEK_SET) < 0)
342 return AV_NOPTS_VALUE;
344 if (!nuv_resync(s, pos_limit))
345 return AV_NOPTS_VALUE;
347 while (!avio_feof(pb) && avio_tell(pb) < pos_limit) {
348 if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
349 return AV_NOPTS_VALUE;
351 size = PKTSIZE(AV_RL32(&hdr[8]));
357 if (frametype == NUV_VIDEO) {
364 if (stream_index == idx) {
366 pos = avio_tell(s->pb) - HDRSIZE;
367 dts = AV_RL32(&hdr[4]);
369 // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
370 av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
371 key ? AVINDEX_KEYFRAME : 0);
381 return AV_NOPTS_VALUE;
385 AVInputFormat ff_nuv_demuxer = {
387 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
388 .priv_data_size = sizeof(NUVContext),
389 .read_probe = nuv_probe,
390 .read_header = nuv_header,
391 .read_packet = nuv_packet,
392 .read_timestamp = nuv_read_dts,
393 .flags = AVFMT_GENERIC_INDEX,