3 * Copyright (c) 2006 Reimar Doeffinger
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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_readwrite.h"
41 static int nuv_probe(AVProbeData *p) {
42 if (!memcmp(p->buf, "NuppelVideo", 12))
43 return AVPROBE_SCORE_MAX;
44 if (!memcmp(p->buf, "MythTVVideo", 12))
45 return AVPROBE_SCORE_MAX;
49 //! little macro to sanitize packet size
50 #define PKTSIZE(s) (s & 0xffffff)
53 * @brief read until we found all data needed for decoding
54 * @param vst video stream of which to change parameters
55 * @param ast video stream of which to change parameters
56 * @param myth set if this is a MythTVVideo format file
57 * @return 1 if all required codec data was found
59 static int get_codec_data(AVIOContext *pb, AVStream *vst,
60 AVStream *ast, int myth) {
61 nuv_frametype frametype;
63 return 1; // no codec data needed
64 while (!pb->eof_reached) {
66 frametype = avio_r8(pb);
69 subtype = avio_r8(pb);
71 size = PKTSIZE(avio_rl32(pb));
72 if (vst && subtype == 'R') {
73 vst->codec->extradata_size = size;
74 vst->codec->extradata = av_malloc(size);
75 avio_read(pb, vst->codec->extradata, size);
83 size = PKTSIZE(avio_rl32(pb));
86 avio_rl32(pb); // version
88 vst->codec->codec_tag = avio_rl32(pb);
89 vst->codec->codec_id =
90 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
91 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
92 vst->codec->codec_id = CODEC_ID_NUV;
97 ast->codec->codec_tag = avio_rl32(pb);
98 ast->codec->sample_rate = avio_rl32(pb);
99 ast->codec->bits_per_coded_sample = avio_rl32(pb);
100 ast->codec->channels = avio_rl32(pb);
101 ast->codec->codec_id =
102 ff_wav_codec_get_id(ast->codec->codec_tag,
103 ast->codec->bits_per_coded_sample);
104 ast->need_parsing = AVSTREAM_PARSE_FULL;
106 avio_skip(pb, 4 * 4);
116 size = PKTSIZE(avio_rl32(pb));
124 static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
125 NUVContext *ctx = s->priv_data;
126 AVIOContext *pb = s->pb;
129 int is_mythtv, width, height, v_packs, a_packs;
131 AVStream *vst = NULL, *ast = NULL;
132 avio_read(pb, id_string, 12);
133 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
134 avio_skip(pb, 5); // version string
135 avio_skip(pb, 3); // padding
136 width = avio_rl32(pb);
137 height = avio_rl32(pb);
138 avio_rl32(pb); // unused, "desiredwidth"
139 avio_rl32(pb); // unused, "desiredheight"
140 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
141 avio_skip(pb, 3); // padding
142 aspect = av_int2dbl(avio_rl64(pb));
143 if (aspect > 0.9999 && aspect < 1.0001)
145 fps = av_int2dbl(avio_rl64(pb));
147 // number of packets per stream type, -1 means unknown, e.g. streaming
148 v_packs = avio_rl32(pb);
149 a_packs = avio_rl32(pb);
150 avio_rl32(pb); // text
152 avio_rl32(pb); // keyframe distance (?)
155 ctx->v_id = stream_nr++;
156 vst = avformat_new_stream(s, NULL);
158 return AVERROR(ENOMEM);
159 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
160 vst->codec->codec_id = CODEC_ID_NUV;
161 vst->codec->width = width;
162 vst->codec->height = height;
163 vst->codec->bits_per_coded_sample = 10;
164 vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
165 vst->r_frame_rate = av_d2q(fps, 60000);
166 av_set_pts_info(vst, 32, 1, 1000);
171 ctx->a_id = stream_nr++;
172 ast = avformat_new_stream(s, NULL);
174 return AVERROR(ENOMEM);
175 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
176 ast->codec->codec_id = CODEC_ID_PCM_S16LE;
177 ast->codec->channels = 2;
178 ast->codec->sample_rate = 44100;
179 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
180 ast->codec->block_align = 2 * 2;
181 ast->codec->bits_per_coded_sample = 16;
182 av_set_pts_info(ast, 32, 1, 1000);
186 get_codec_data(pb, vst, ast, is_mythtv);
187 ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV;
193 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
194 NUVContext *ctx = s->priv_data;
195 AVIOContext *pb = s->pb;
196 uint8_t hdr[HDRSIZE];
197 nuv_frametype frametype;
199 while (!pb->eof_reached) {
200 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
201 uint64_t pos = avio_tell(pb);
202 ret = avio_read(pb, hdr, HDRSIZE);
204 return ret < 0 ? ret : AVERROR(EIO);
206 size = PKTSIZE(AV_RL32(&hdr[8]));
209 if (!ctx->rtjpg_video) {
215 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
219 ret = av_new_packet(pkt, copyhdrsize + size);
222 // HACK: we have no idea if it is a keyframe,
223 // but if we mark none seeking will not work at all.
224 pkt->flags |= AV_PKT_FLAG_KEY;
226 pkt->pts = AV_RL32(&hdr[4]);
227 pkt->stream_index = ctx->v_id;
228 memcpy(pkt->data, hdr, copyhdrsize);
229 ret = avio_read(pb, pkt->data + copyhdrsize, size);
235 av_shrink_packet(pkt, copyhdrsize + ret);
239 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
243 ret = av_get_packet(pb, pkt, size);
244 pkt->flags |= AV_PKT_FLAG_KEY;
246 pkt->pts = AV_RL32(&hdr[4]);
247 pkt->stream_index = ctx->a_id;
248 if (ret < 0) return ret;
251 // contains no data, size value is invalid
261 AVInputFormat ff_nuv_demuxer = {
263 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo format"),
264 .priv_data_size = sizeof(NUVContext),
265 .read_probe = nuv_probe,
266 .read_header = nuv_header,
267 .read_packet = nuv_packet,
268 .flags = AVFMT_GENERIC_INDEX,