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/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) {
50 if (!memcmp(p->buf, "NuppelVideo", 12))
51 return AVPROBE_SCORE_MAX;
52 if (!memcmp(p->buf, "MythTVVideo", 12))
53 return AVPROBE_SCORE_MAX;
57 /// little macro to sanitize packet size
58 #define PKTSIZE(s) (s & 0xffffff)
61 * @brief read until we found all data needed for decoding
62 * @param vst video stream of which to change parameters
63 * @param ast video stream of which to change parameters
64 * @param myth set if this is a MythTVVideo format file
65 * @return 1 if all required codec data was found
67 static int get_codec_data(AVIOContext *pb, AVStream *vst,
68 AVStream *ast, int myth) {
69 nuv_frametype frametype;
71 return 1; // no codec data needed
72 while (!pb->eof_reached) {
74 frametype = avio_r8(pb);
77 subtype = avio_r8(pb);
79 size = PKTSIZE(avio_rl32(pb));
80 if (vst && subtype == 'R') {
81 vst->codec->extradata_size = size;
82 vst->codec->extradata = av_malloc(size);
83 avio_read(pb, vst->codec->extradata, size);
91 size = PKTSIZE(avio_rl32(pb));
94 avio_rl32(pb); // version
96 vst->codec->codec_tag = avio_rl32(pb);
97 vst->codec->codec_id =
98 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
99 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
100 vst->codec->codec_id = AV_CODEC_ID_NUV;
107 ast->codec->codec_tag = avio_rl32(pb);
108 ast->codec->sample_rate = avio_rl32(pb);
109 ast->codec->bits_per_coded_sample = avio_rl32(pb);
110 ast->codec->channels = avio_rl32(pb);
111 ast->codec->channel_layout = 0;
113 id = ff_wav_codec_get_id(ast->codec->codec_tag,
114 ast->codec->bits_per_coded_sample);
115 if (id == AV_CODEC_ID_NONE) {
116 id = ff_codec_get_id(nuv_audio_tags,
117 ast->codec->codec_tag);
118 if (id == AV_CODEC_ID_PCM_S16LE)
119 id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample,
122 ast->codec->codec_id = id;
124 ast->need_parsing = AVSTREAM_PARSE_FULL;
126 avio_skip(pb, 4 * 4);
136 size = PKTSIZE(avio_rl32(pb));
144 static int nuv_header(AVFormatContext *s) {
145 NUVContext *ctx = s->priv_data;
146 AVIOContext *pb = s->pb;
149 int is_mythtv, width, height, v_packs, a_packs;
151 AVStream *vst = NULL, *ast = NULL;
152 avio_read(pb, id_string, 12);
153 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
154 avio_skip(pb, 5); // version string
155 avio_skip(pb, 3); // padding
156 width = avio_rl32(pb);
157 height = avio_rl32(pb);
158 avio_rl32(pb); // unused, "desiredwidth"
159 avio_rl32(pb); // unused, "desiredheight"
160 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
161 avio_skip(pb, 3); // padding
162 aspect = av_int2double(avio_rl64(pb));
163 if (aspect > 0.9999 && aspect < 1.0001)
165 fps = av_int2double(avio_rl64(pb));
167 // number of packets per stream type, -1 means unknown, e.g. streaming
168 v_packs = avio_rl32(pb);
169 a_packs = avio_rl32(pb);
170 avio_rl32(pb); // text
172 avio_rl32(pb); // keyframe distance (?)
175 ctx->v_id = stream_nr++;
176 vst = avformat_new_stream(s, NULL);
178 return AVERROR(ENOMEM);
179 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
180 vst->codec->codec_id = AV_CODEC_ID_NUV;
181 vst->codec->width = width;
182 vst->codec->height = height;
183 vst->codec->bits_per_coded_sample = 10;
184 vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
185 #if FF_API_R_FRAME_RATE
188 vst->avg_frame_rate = av_d2q(fps, 60000);
189 avpriv_set_pts_info(vst, 32, 1, 1000);
194 ctx->a_id = stream_nr++;
195 ast = avformat_new_stream(s, NULL);
197 return AVERROR(ENOMEM);
198 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
199 ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
200 ast->codec->channels = 2;
201 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
202 ast->codec->sample_rate = 44100;
203 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
204 ast->codec->block_align = 2 * 2;
205 ast->codec->bits_per_coded_sample = 16;
206 avpriv_set_pts_info(ast, 32, 1, 1000);
210 get_codec_data(pb, vst, ast, is_mythtv);
211 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
217 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
218 NUVContext *ctx = s->priv_data;
219 AVIOContext *pb = s->pb;
220 uint8_t hdr[HDRSIZE];
221 nuv_frametype frametype;
223 while (!pb->eof_reached) {
224 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
225 uint64_t pos = avio_tell(pb);
226 ret = avio_read(pb, hdr, HDRSIZE);
228 return ret < 0 ? ret : AVERROR(EIO);
230 size = PKTSIZE(AV_RL32(&hdr[8]));
233 if (!ctx->rtjpg_video) {
239 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
243 ret = av_new_packet(pkt, copyhdrsize + size);
246 // HACK: we have no idea if it is a keyframe,
247 // but if we mark none seeking will not work at all.
248 pkt->flags |= AV_PKT_FLAG_KEY;
250 pkt->pts = AV_RL32(&hdr[4]);
251 pkt->stream_index = ctx->v_id;
252 memcpy(pkt->data, hdr, copyhdrsize);
253 ret = avio_read(pb, pkt->data + copyhdrsize, size);
259 av_shrink_packet(pkt, copyhdrsize + ret);
263 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
267 ret = av_get_packet(pb, pkt, size);
268 pkt->flags |= AV_PKT_FLAG_KEY;
270 pkt->pts = AV_RL32(&hdr[4]);
271 pkt->stream_index = ctx->a_id;
272 if (ret < 0) return ret;
275 // contains no data, size value is invalid
285 AVInputFormat ff_nuv_demuxer = {
287 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
288 .priv_data_size = sizeof(NUVContext),
289 .read_probe = nuv_probe,
290 .read_header = nuv_header,
291 .read_packet = nuv_packet,
292 .flags = AVFMT_GENERIC_INDEX,