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)
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 1 if all required codec data was found
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 (!pb->eof_reached) {
78 frametype = avio_r8(pb);
81 subtype = avio_r8(pb);
83 size = PKTSIZE(avio_rl32(pb));
84 if (vst && subtype == 'R') {
85 vst->codec->extradata_size = size;
86 vst->codec->extradata = av_malloc(size);
87 avio_read(pb, vst->codec->extradata, size);
95 size = PKTSIZE(avio_rl32(pb));
98 avio_rl32(pb); // version
100 vst->codec->codec_tag = avio_rl32(pb);
101 vst->codec->codec_id =
102 ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
103 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
104 vst->codec->codec_id = AV_CODEC_ID_NUV;
111 ast->codec->codec_tag = avio_rl32(pb);
112 ast->codec->sample_rate = avio_rl32(pb);
113 ast->codec->bits_per_coded_sample = avio_rl32(pb);
114 ast->codec->channels = avio_rl32(pb);
115 ast->codec->channel_layout = 0;
117 id = ff_wav_codec_get_id(ast->codec->codec_tag,
118 ast->codec->bits_per_coded_sample);
119 if (id == AV_CODEC_ID_NONE) {
120 id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
121 if (id == AV_CODEC_ID_PCM_S16LE)
122 id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample,
125 ast->codec->codec_id = id;
127 ast->need_parsing = AVSTREAM_PARSE_FULL;
129 avio_skip(pb, 4 * 4);
139 size = PKTSIZE(avio_rl32(pb));
148 static int nuv_header(AVFormatContext *s)
150 NUVContext *ctx = s->priv_data;
151 AVIOContext *pb = s->pb;
154 int is_mythtv, width, height, v_packs, a_packs;
156 AVStream *vst = NULL, *ast = NULL;
158 avio_read(pb, id_string, 12);
159 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
160 avio_skip(pb, 5); // version string
161 avio_skip(pb, 3); // padding
162 width = avio_rl32(pb);
163 height = avio_rl32(pb);
164 avio_rl32(pb); // unused, "desiredwidth"
165 avio_rl32(pb); // unused, "desiredheight"
166 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
167 avio_skip(pb, 3); // padding
168 aspect = av_int2double(avio_rl64(pb));
169 if (aspect > 0.9999 && aspect < 1.0001)
171 fps = av_int2double(avio_rl64(pb));
173 // number of packets per stream type, -1 means unknown, e.g. streaming
174 v_packs = avio_rl32(pb);
175 a_packs = avio_rl32(pb);
176 avio_rl32(pb); // text
178 avio_rl32(pb); // keyframe distance (?)
181 ctx->v_id = stream_nr++;
182 vst = avformat_new_stream(s, NULL);
184 return AVERROR(ENOMEM);
185 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
186 vst->codec->codec_id = AV_CODEC_ID_NUV;
187 vst->codec->width = width;
188 vst->codec->height = height;
189 vst->codec->bits_per_coded_sample = 10;
190 vst->sample_aspect_ratio = av_d2q(aspect * height / width,
192 #if FF_API_R_FRAME_RATE
195 vst->avg_frame_rate = av_d2q(fps, 60000);
196 avpriv_set_pts_info(vst, 32, 1, 1000);
201 ctx->a_id = stream_nr++;
202 ast = avformat_new_stream(s, NULL);
204 return AVERROR(ENOMEM);
205 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
206 ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
207 ast->codec->channels = 2;
208 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
209 ast->codec->sample_rate = 44100;
210 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
211 ast->codec->block_align = 2 * 2;
212 ast->codec->bits_per_coded_sample = 16;
213 avpriv_set_pts_info(ast, 32, 1, 1000);
217 get_codec_data(pb, vst, ast, is_mythtv);
218 ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
225 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
227 NUVContext *ctx = s->priv_data;
228 AVIOContext *pb = s->pb;
229 uint8_t hdr[HDRSIZE];
230 nuv_frametype frametype;
233 while (!pb->eof_reached) {
234 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
235 uint64_t pos = avio_tell(pb);
237 ret = avio_read(pb, hdr, HDRSIZE);
239 return ret < 0 ? ret : AVERROR(EIO);
242 size = PKTSIZE(AV_RL32(&hdr[8]));
246 if (!ctx->rtjpg_video) {
252 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
256 ret = av_new_packet(pkt, copyhdrsize + size);
259 // HACK: we have no idea if it is a keyframe,
260 // but if we mark none seeking will not work at all.
261 pkt->flags |= AV_PKT_FLAG_KEY;
263 pkt->pts = AV_RL32(&hdr[4]);
264 pkt->stream_index = ctx->v_id;
265 memcpy(pkt->data, hdr, copyhdrsize);
266 ret = avio_read(pb, pkt->data + copyhdrsize, size);
272 av_shrink_packet(pkt, copyhdrsize + ret);
276 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
280 ret = av_get_packet(pb, pkt, size);
281 pkt->flags |= AV_PKT_FLAG_KEY;
283 pkt->pts = AV_RL32(&hdr[4]);
284 pkt->stream_index = ctx->a_id;
289 // contains no data, size value is invalid
300 AVInputFormat ff_nuv_demuxer = {
302 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
303 .priv_data_size = sizeof(NUVContext),
304 .read_probe = nuv_probe,
305 .read_header = nuv_header,
306 .read_packet = nuv_packet,
307 .flags = AVFMT_GENERIC_INDEX,