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/intreadwrite.h"
24 #include "libavutil/intfloat.h"
29 static const AVCodecTag nuv_audio_tags[] = {
30 { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
31 { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
32 { AV_CODEC_ID_NONE, 0 },
49 static int nuv_probe(AVProbeData *p)
51 if (!memcmp(p->buf, "NuppelVideo", 12))
52 return AVPROBE_SCORE_MAX;
53 if (!memcmp(p->buf, "MythTVVideo", 12))
54 return AVPROBE_SCORE_MAX;
58 /// little macro to sanitize packet size
59 #define PKTSIZE(s) (s & 0xffffff)
62 * @brief read until we found all data needed for decoding
63 * @param vst video stream of which to change parameters
64 * @param ast video stream of which to change parameters
65 * @param myth set if this is a MythTVVideo format file
66 * @return 0 or AVERROR code
68 static int get_codec_data(AVIOContext *pb, AVStream *vst,
69 AVStream *ast, int myth)
71 nuv_frametype frametype;
74 return 1; // no codec data needed
75 while (!url_feof(pb)) {
78 frametype = avio_r8(pb);
81 subtype = avio_r8(pb);
83 size = PKTSIZE(avio_rl32(pb));
84 if (vst && subtype == 'R') {
85 if (vst->codec->extradata) {
86 av_freep(&vst->codec->extradata);
87 vst->codec->extradata_size = 0;
89 if (ff_alloc_extradata(vst->codec, size))
90 return AVERROR(ENOMEM);
91 avio_read(pb, vst->codec->extradata, size);
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 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
190 vst->codec->codec_id = AV_CODEC_ID_NUV;
191 vst->codec->width = width;
192 vst->codec->height = height;
193 vst->codec->bits_per_coded_sample = 10;
194 vst->sample_aspect_ratio = av_d2q(aspect * height / width,
196 #if FF_API_R_FRAME_RATE
199 vst->avg_frame_rate = av_d2q(fps, 60000);
200 avpriv_set_pts_info(vst, 32, 1, 1000);
205 ast = avformat_new_stream(s, NULL);
207 return AVERROR(ENOMEM);
208 ctx->a_id = ast->index;
210 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
211 ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
212 ast->codec->channels = 2;
213 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
214 ast->codec->sample_rate = 44100;
215 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
216 ast->codec->block_align = 2 * 2;
217 ast->codec->bits_per_coded_sample = 16;
218 avpriv_set_pts_info(ast, 32, 1, 1000);
222 if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
225 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
232 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
234 NUVContext *ctx = s->priv_data;
235 AVIOContext *pb = s->pb;
236 uint8_t hdr[HDRSIZE];
237 nuv_frametype frametype;
240 while (!url_feof(pb)) {
241 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
242 uint64_t pos = avio_tell(pb);
244 ret = avio_read(pb, hdr, HDRSIZE);
246 return ret < 0 ? ret : AVERROR(EIO);
249 size = PKTSIZE(AV_RL32(&hdr[8]));
253 if (!ctx->rtjpg_video) {
259 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
263 ret = av_new_packet(pkt, copyhdrsize + size);
268 pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
269 pkt->pts = AV_RL32(&hdr[4]);
270 pkt->stream_index = ctx->v_id;
271 memcpy(pkt->data, hdr, copyhdrsize);
272 ret = avio_read(pb, pkt->data + copyhdrsize, size);
278 av_shrink_packet(pkt, copyhdrsize + ret);
282 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
286 ret = av_get_packet(pb, pkt, size);
287 pkt->flags |= AV_PKT_FLAG_KEY;
289 pkt->pts = AV_RL32(&hdr[4]);
290 pkt->stream_index = ctx->a_id;
295 // contains no data, size value is invalid
307 * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
308 * \return 1 if the syncword is found 0 otherwise.
310 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
311 AVIOContext *pb = s->pb;
313 while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
314 tag = (tag << 8) | avio_r8(pb);
315 if (tag == MKBETAG('R','T','j','j') &&
316 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
317 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
324 * \brief attempts to read a timestamp from stream at the given stream position
325 * \return timestamp if successful and AV_NOPTS_VALUE if failure
327 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
328 int64_t *ppos, int64_t pos_limit)
330 NUVContext *ctx = s->priv_data;
331 AVIOContext *pb = s->pb;
332 uint8_t hdr[HDRSIZE];
333 nuv_frametype frametype;
337 if (avio_seek(pb, *ppos, SEEK_SET) < 0)
338 return AV_NOPTS_VALUE;
340 if (!nuv_resync(s, pos_limit))
341 return AV_NOPTS_VALUE;
343 while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
344 if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
345 return AV_NOPTS_VALUE;
347 size = PKTSIZE(AV_RL32(&hdr[8]));
353 if (frametype == NUV_VIDEO) {
360 if (stream_index == idx) {
362 pos = avio_tell(s->pb) - HDRSIZE;
363 dts = AV_RL32(&hdr[4]);
365 // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
366 av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
367 key ? AVINDEX_KEYFRAME : 0);
377 return AV_NOPTS_VALUE;
381 AVInputFormat ff_nuv_demuxer = {
383 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
384 .priv_data_size = sizeof(NUVContext),
385 .read_probe = nuv_probe,
386 .read_header = nuv_header,
387 .read_packet = nuv_packet,
388 .read_timestamp = nuv_read_dts,
389 .flags = AVFMT_GENERIC_INDEX,