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/intreadwrite.h"
23 #include "libavutil/intfloat.h"
42 static int nuv_probe(AVProbeData *p) {
43 if (!memcmp(p->buf, "NuppelVideo", 12))
44 return AVPROBE_SCORE_MAX;
45 if (!memcmp(p->buf, "MythTVVideo", 12))
46 return AVPROBE_SCORE_MAX;
50 /// little macro to sanitize packet size
51 #define PKTSIZE(s) (s & 0xffffff)
54 * @brief read until we found all data needed for decoding
55 * @param vst video stream of which to change parameters
56 * @param ast video stream of which to change parameters
57 * @param myth set if this is a MythTVVideo format file
58 * @return 1 if all required codec data was found
60 static int get_codec_data(AVIOContext *pb, AVStream *vst,
61 AVStream *ast, int myth) {
62 nuv_frametype frametype;
64 return 1; // no codec data needed
65 while (!url_feof(pb)) {
67 frametype = avio_r8(pb);
70 subtype = avio_r8(pb);
72 size = PKTSIZE(avio_rl32(pb));
73 if (vst && subtype == 'R') {
74 vst->codec->extradata_size = size;
75 vst->codec->extradata = av_malloc(size);
76 avio_read(pb, vst->codec->extradata, size);
84 size = PKTSIZE(avio_rl32(pb));
87 avio_rl32(pb); // version
89 vst->codec->codec_tag = avio_rl32(pb);
90 vst->codec->codec_id =
91 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
92 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
93 vst->codec->codec_id = AV_CODEC_ID_NUV;
98 ast->codec->codec_tag = avio_rl32(pb);
99 ast->codec->sample_rate = avio_rl32(pb);
100 ast->codec->bits_per_coded_sample = avio_rl32(pb);
101 ast->codec->channels = avio_rl32(pb);
102 ast->codec->codec_id =
103 ff_wav_codec_get_id(ast->codec->codec_tag,
104 ast->codec->bits_per_coded_sample);
105 ast->need_parsing = AVSTREAM_PARSE_FULL;
107 avio_skip(pb, 4 * 4);
117 size = PKTSIZE(avio_rl32(pb));
125 static int nuv_header(AVFormatContext *s) {
126 NUVContext *ctx = s->priv_data;
127 AVIOContext *pb = s->pb;
130 int is_mythtv, width, height, v_packs, a_packs;
132 AVStream *vst = NULL, *ast = NULL;
133 avio_read(pb, id_string, 12);
134 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
135 avio_skip(pb, 5); // version string
136 avio_skip(pb, 3); // padding
137 width = avio_rl32(pb);
138 height = avio_rl32(pb);
139 avio_rl32(pb); // unused, "desiredwidth"
140 avio_rl32(pb); // unused, "desiredheight"
141 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
142 avio_skip(pb, 3); // padding
143 aspect = av_int2double(avio_rl64(pb));
144 if (aspect > 0.9999 && aspect < 1.0001)
146 fps = av_int2double(avio_rl64(pb));
148 // number of packets per stream type, -1 means unknown, e.g. streaming
149 v_packs = avio_rl32(pb);
150 a_packs = avio_rl32(pb);
151 avio_rl32(pb); // text
153 avio_rl32(pb); // keyframe distance (?)
156 ctx->v_id = stream_nr++;
157 vst = avformat_new_stream(s, NULL);
159 return AVERROR(ENOMEM);
160 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
161 vst->codec->codec_id = AV_CODEC_ID_NUV;
162 vst->codec->width = width;
163 vst->codec->height = height;
164 vst->codec->bits_per_coded_sample = 10;
165 vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
166 #if FF_API_R_FRAME_RATE
169 vst->avg_frame_rate = av_d2q(fps, 60000);
170 avpriv_set_pts_info(vst, 32, 1, 1000);
175 ctx->a_id = stream_nr++;
176 ast = avformat_new_stream(s, NULL);
178 return AVERROR(ENOMEM);
179 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
180 ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
181 ast->codec->channels = 2;
182 ast->codec->sample_rate = 44100;
183 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
184 ast->codec->block_align = 2 * 2;
185 ast->codec->bits_per_coded_sample = 16;
186 avpriv_set_pts_info(ast, 32, 1, 1000);
190 get_codec_data(pb, vst, ast, is_mythtv);
191 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
197 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
198 NUVContext *ctx = s->priv_data;
199 AVIOContext *pb = s->pb;
200 uint8_t hdr[HDRSIZE];
201 nuv_frametype frametype;
203 while (!url_feof(pb)) {
204 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
205 uint64_t pos = avio_tell(pb);
206 ret = avio_read(pb, hdr, HDRSIZE);
208 return ret < 0 ? ret : AVERROR(EIO);
210 size = PKTSIZE(AV_RL32(&hdr[8]));
213 if (!ctx->rtjpg_video) {
219 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
223 ret = av_new_packet(pkt, copyhdrsize + size);
228 pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
229 pkt->pts = AV_RL32(&hdr[4]);
230 pkt->stream_index = ctx->v_id;
231 memcpy(pkt->data, hdr, copyhdrsize);
232 ret = avio_read(pb, pkt->data + copyhdrsize, size);
238 av_shrink_packet(pkt, copyhdrsize + ret);
242 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
246 ret = av_get_packet(pb, pkt, size);
247 pkt->flags |= AV_PKT_FLAG_KEY;
249 pkt->pts = AV_RL32(&hdr[4]);
250 pkt->stream_index = ctx->a_id;
251 if (ret < 0) return ret;
254 // contains no data, size value is invalid
265 * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
266 * \return 1 if the syncword is found 0 otherwise.
268 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
269 AVIOContext *pb = s->pb;
271 while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
272 tag = (tag << 8) | avio_r8(pb);
273 if (tag == MKBETAG('R','T','j','j') &&
274 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
275 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
282 * \brief attempts to read a timestamp from stream at the given stream position
283 * \return timestamp if successful and AV_NOPTS_VALUE if failure
285 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
286 int64_t *ppos, int64_t pos_limit)
288 NUVContext *ctx = s->priv_data;
289 AVIOContext *pb = s->pb;
290 uint8_t hdr[HDRSIZE];
291 nuv_frametype frametype;
295 if (avio_seek(pb, *ppos, SEEK_SET) < 0)
296 return AV_NOPTS_VALUE;
298 if (!nuv_resync(s, pos_limit))
299 return AV_NOPTS_VALUE;
301 while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
302 if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
303 return AV_NOPTS_VALUE;
305 size = PKTSIZE(AV_RL32(&hdr[8]));
311 if (frametype == NUV_VIDEO) {
318 if (stream_index == idx) {
320 pos = avio_tell(s->pb) - HDRSIZE;
321 dts = AV_RL32(&hdr[4]);
323 // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
324 av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
325 key ? AVINDEX_KEYFRAME : 0);
335 return AV_NOPTS_VALUE;
339 AVInputFormat ff_nuv_demuxer = {
341 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
342 .priv_data_size = sizeof(NUVContext),
343 .read_probe = nuv_probe,
344 .read_header = nuv_header,
345 .read_packet = nuv_packet,
346 .read_timestamp = nuv_read_dts,
347 .flags = AVFMT_GENERIC_INDEX,