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"
43 static int nuv_probe(AVProbeData *p) {
44 if (!memcmp(p->buf, "NuppelVideo", 12))
45 return AVPROBE_SCORE_MAX;
46 if (!memcmp(p->buf, "MythTVVideo", 12))
47 return AVPROBE_SCORE_MAX;
51 /// little macro to sanitize packet size
52 #define PKTSIZE(s) (s & 0xffffff)
55 * @brief read until we found all data needed for decoding
56 * @param vst video stream of which to change parameters
57 * @param ast video stream of which to change parameters
58 * @param myth set if this is a MythTVVideo format file
59 * @return 1 if all required codec data was found
61 static int get_codec_data(AVIOContext *pb, AVStream *vst,
62 AVStream *ast, int myth) {
63 nuv_frametype frametype;
65 return 1; // no codec data needed
66 while (!url_feof(pb)) {
68 frametype = avio_r8(pb);
71 subtype = avio_r8(pb);
73 size = PKTSIZE(avio_rl32(pb));
74 if (vst && subtype == 'R') {
75 vst->codec->extradata_size = size;
76 vst->codec->extradata = av_malloc(size);
77 avio_read(pb, vst->codec->extradata, size);
85 size = PKTSIZE(avio_rl32(pb));
88 avio_rl32(pb); // version
90 vst->codec->codec_tag = avio_rl32(pb);
91 vst->codec->codec_id =
92 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
93 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
94 vst->codec->codec_id = AV_CODEC_ID_NUV;
99 ast->codec->codec_tag = avio_rl32(pb);
100 ast->codec->sample_rate = avio_rl32(pb);
101 ast->codec->bits_per_coded_sample = avio_rl32(pb);
102 ast->codec->channels = avio_rl32(pb);
103 ast->codec->channel_layout = 0;
104 ast->codec->codec_id =
105 ff_wav_codec_get_id(ast->codec->codec_tag,
106 ast->codec->bits_per_coded_sample);
107 ast->need_parsing = AVSTREAM_PARSE_FULL;
109 avio_skip(pb, 4 * 4);
119 size = PKTSIZE(avio_rl32(pb));
127 static int nuv_header(AVFormatContext *s) {
128 NUVContext *ctx = s->priv_data;
129 AVIOContext *pb = s->pb;
132 int is_mythtv, width, height, v_packs, a_packs;
134 AVStream *vst = NULL, *ast = NULL;
135 avio_read(pb, id_string, 12);
136 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
137 avio_skip(pb, 5); // version string
138 avio_skip(pb, 3); // padding
139 width = avio_rl32(pb);
140 height = avio_rl32(pb);
141 avio_rl32(pb); // unused, "desiredwidth"
142 avio_rl32(pb); // unused, "desiredheight"
143 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
144 avio_skip(pb, 3); // padding
145 aspect = av_int2double(avio_rl64(pb));
146 if (aspect > 0.9999 && aspect < 1.0001)
148 fps = av_int2double(avio_rl64(pb));
150 // number of packets per stream type, -1 means unknown, e.g. streaming
151 v_packs = avio_rl32(pb);
152 a_packs = avio_rl32(pb);
153 avio_rl32(pb); // text
155 avio_rl32(pb); // keyframe distance (?)
158 ctx->v_id = stream_nr++;
159 vst = avformat_new_stream(s, NULL);
161 return AVERROR(ENOMEM);
162 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
163 vst->codec->codec_id = AV_CODEC_ID_NUV;
164 vst->codec->width = width;
165 vst->codec->height = height;
166 vst->codec->bits_per_coded_sample = 10;
167 vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
168 #if FF_API_R_FRAME_RATE
171 vst->avg_frame_rate = av_d2q(fps, 60000);
172 avpriv_set_pts_info(vst, 32, 1, 1000);
177 ctx->a_id = stream_nr++;
178 ast = avformat_new_stream(s, NULL);
180 return AVERROR(ENOMEM);
181 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
182 ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
183 ast->codec->channels = 2;
184 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
185 ast->codec->sample_rate = 44100;
186 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
187 ast->codec->block_align = 2 * 2;
188 ast->codec->bits_per_coded_sample = 16;
189 avpriv_set_pts_info(ast, 32, 1, 1000);
193 get_codec_data(pb, vst, ast, is_mythtv);
194 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
200 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
201 NUVContext *ctx = s->priv_data;
202 AVIOContext *pb = s->pb;
203 uint8_t hdr[HDRSIZE];
204 nuv_frametype frametype;
206 while (!url_feof(pb)) {
207 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
208 uint64_t pos = avio_tell(pb);
209 ret = avio_read(pb, hdr, HDRSIZE);
211 return ret < 0 ? ret : AVERROR(EIO);
213 size = PKTSIZE(AV_RL32(&hdr[8]));
216 if (!ctx->rtjpg_video) {
222 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
226 ret = av_new_packet(pkt, copyhdrsize + size);
231 pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
232 pkt->pts = AV_RL32(&hdr[4]);
233 pkt->stream_index = ctx->v_id;
234 memcpy(pkt->data, hdr, copyhdrsize);
235 ret = avio_read(pb, pkt->data + copyhdrsize, size);
241 av_shrink_packet(pkt, copyhdrsize + ret);
245 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
249 ret = av_get_packet(pb, pkt, size);
250 pkt->flags |= AV_PKT_FLAG_KEY;
252 pkt->pts = AV_RL32(&hdr[4]);
253 pkt->stream_index = ctx->a_id;
254 if (ret < 0) return ret;
257 // contains no data, size value is invalid
268 * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
269 * \return 1 if the syncword is found 0 otherwise.
271 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
272 AVIOContext *pb = s->pb;
274 while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
275 tag = (tag << 8) | avio_r8(pb);
276 if (tag == MKBETAG('R','T','j','j') &&
277 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
278 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
285 * \brief attempts to read a timestamp from stream at the given stream position
286 * \return timestamp if successful and AV_NOPTS_VALUE if failure
288 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
289 int64_t *ppos, int64_t pos_limit)
291 NUVContext *ctx = s->priv_data;
292 AVIOContext *pb = s->pb;
293 uint8_t hdr[HDRSIZE];
294 nuv_frametype frametype;
298 if (avio_seek(pb, *ppos, SEEK_SET) < 0)
299 return AV_NOPTS_VALUE;
301 if (!nuv_resync(s, pos_limit))
302 return AV_NOPTS_VALUE;
304 while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
305 if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
306 return AV_NOPTS_VALUE;
308 size = PKTSIZE(AV_RL32(&hdr[8]));
314 if (frametype == NUV_VIDEO) {
321 if (stream_index == idx) {
323 pos = avio_tell(s->pb) - HDRSIZE;
324 dts = AV_RL32(&hdr[4]);
326 // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
327 av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
328 key ? AVINDEX_KEYFRAME : 0);
338 return AV_NOPTS_VALUE;
342 AVInputFormat ff_nuv_demuxer = {
344 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
345 .priv_data_size = sizeof(NUVContext),
346 .read_probe = nuv_probe,
347 .read_header = nuv_header,
348 .read_packet = nuv_packet,
349 .read_timestamp = nuv_read_dts,
350 .flags = AVFMT_GENERIC_INDEX,