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 vst->codec->extradata = av_malloc(size);
90 if (!vst->codec->extradata)
91 return AVERROR(ENOMEM);
92 vst->codec->extradata_size = size;
93 avio_read(pb, vst->codec->extradata, size);
101 size = PKTSIZE(avio_rl32(pb));
104 avio_rl32(pb); // version
106 vst->codec->codec_tag = avio_rl32(pb);
107 vst->codec->codec_id =
108 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
109 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
110 vst->codec->codec_id = AV_CODEC_ID_NUV;
117 ast->codec->codec_tag = avio_rl32(pb);
118 ast->codec->sample_rate = avio_rl32(pb);
119 ast->codec->bits_per_coded_sample = avio_rl32(pb);
120 ast->codec->channels = avio_rl32(pb);
121 ast->codec->channel_layout = 0;
123 id = ff_wav_codec_get_id(ast->codec->codec_tag,
124 ast->codec->bits_per_coded_sample);
125 if (id == AV_CODEC_ID_NONE) {
126 id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
127 if (id == AV_CODEC_ID_PCM_S16LE)
128 id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample,
131 ast->codec->codec_id = id;
133 ast->need_parsing = AVSTREAM_PARSE_FULL;
135 avio_skip(pb, 4 * 4);
145 size = PKTSIZE(avio_rl32(pb));
154 static int nuv_header(AVFormatContext *s)
156 NUVContext *ctx = s->priv_data;
157 AVIOContext *pb = s->pb;
160 int is_mythtv, width, height, v_packs, a_packs, ret;
161 AVStream *vst = NULL, *ast = NULL;
163 avio_read(pb, id_string, 12);
164 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
165 avio_skip(pb, 5); // version string
166 avio_skip(pb, 3); // padding
167 width = avio_rl32(pb);
168 height = avio_rl32(pb);
169 avio_rl32(pb); // unused, "desiredwidth"
170 avio_rl32(pb); // unused, "desiredheight"
171 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
172 avio_skip(pb, 3); // padding
173 aspect = av_int2double(avio_rl64(pb));
174 if (aspect > 0.9999 && aspect < 1.0001)
176 fps = av_int2double(avio_rl64(pb));
178 // number of packets per stream type, -1 means unknown, e.g. streaming
179 v_packs = avio_rl32(pb);
180 a_packs = avio_rl32(pb);
181 avio_rl32(pb); // text
183 avio_rl32(pb); // keyframe distance (?)
186 vst = avformat_new_stream(s, NULL);
188 return AVERROR(ENOMEM);
189 ctx->v_id = vst->index;
191 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
192 vst->codec->codec_id = AV_CODEC_ID_NUV;
193 vst->codec->width = width;
194 vst->codec->height = height;
195 vst->codec->bits_per_coded_sample = 10;
196 vst->sample_aspect_ratio = av_d2q(aspect * height / width,
198 #if FF_API_R_FRAME_RATE
201 vst->avg_frame_rate = av_d2q(fps, 60000);
202 avpriv_set_pts_info(vst, 32, 1, 1000);
207 ast = avformat_new_stream(s, NULL);
209 return AVERROR(ENOMEM);
210 ctx->a_id = ast->index;
212 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
213 ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
214 ast->codec->channels = 2;
215 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
216 ast->codec->sample_rate = 44100;
217 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
218 ast->codec->block_align = 2 * 2;
219 ast->codec->bits_per_coded_sample = 16;
220 avpriv_set_pts_info(ast, 32, 1, 1000);
224 if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
227 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
234 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
236 NUVContext *ctx = s->priv_data;
237 AVIOContext *pb = s->pb;
238 uint8_t hdr[HDRSIZE];
239 nuv_frametype frametype;
242 while (!url_feof(pb)) {
243 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
244 uint64_t pos = avio_tell(pb);
246 ret = avio_read(pb, hdr, HDRSIZE);
248 return ret < 0 ? ret : AVERROR(EIO);
251 size = PKTSIZE(AV_RL32(&hdr[8]));
255 if (!ctx->rtjpg_video) {
261 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
265 ret = av_new_packet(pkt, copyhdrsize + size);
270 pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
271 pkt->pts = AV_RL32(&hdr[4]);
272 pkt->stream_index = ctx->v_id;
273 memcpy(pkt->data, hdr, copyhdrsize);
274 ret = avio_read(pb, pkt->data + copyhdrsize, size);
280 av_shrink_packet(pkt, copyhdrsize + ret);
284 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
288 ret = av_get_packet(pb, pkt, size);
289 pkt->flags |= AV_PKT_FLAG_KEY;
291 pkt->pts = AV_RL32(&hdr[4]);
292 pkt->stream_index = ctx->a_id;
297 // contains no data, size value is invalid
309 * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
310 * \return 1 if the syncword is found 0 otherwise.
312 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
313 AVIOContext *pb = s->pb;
315 while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
316 tag = (tag << 8) | avio_r8(pb);
317 if (tag == MKBETAG('R','T','j','j') &&
318 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
319 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
326 * \brief attempts to read a timestamp from stream at the given stream position
327 * \return timestamp if successful and AV_NOPTS_VALUE if failure
329 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
330 int64_t *ppos, int64_t pos_limit)
332 NUVContext *ctx = s->priv_data;
333 AVIOContext *pb = s->pb;
334 uint8_t hdr[HDRSIZE];
335 nuv_frametype frametype;
339 if (avio_seek(pb, *ppos, SEEK_SET) < 0)
340 return AV_NOPTS_VALUE;
342 if (!nuv_resync(s, pos_limit))
343 return AV_NOPTS_VALUE;
345 while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
346 if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
347 return AV_NOPTS_VALUE;
349 size = PKTSIZE(AV_RL32(&hdr[8]));
355 if (frametype == NUV_VIDEO) {
362 if (stream_index == idx) {
364 pos = avio_tell(s->pb) - HDRSIZE;
365 dts = AV_RL32(&hdr[4]);
367 // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
368 av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
369 key ? AVINDEX_KEYFRAME : 0);
379 return AV_NOPTS_VALUE;
383 AVInputFormat ff_nuv_demuxer = {
385 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
386 .priv_data_size = sizeof(NUVContext),
387 .read_probe = nuv_probe,
388 .read_header = nuv_header,
389 .read_packet = nuv_packet,
390 .read_timestamp = nuv_read_dts,
391 .flags = AVFMT_GENERIC_INDEX,