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source: vbox/trunk/src/libs/ffmpeg-20060710/libavformat/nuv.c@ 9728

Last change on this file since 9728 was 5776, checked in by vboxsync, 17 years ago

ffmpeg: exported to OSE
File size: 7.8 KB
Line 
1/*
2 * NuppelVideo demuxer.
3 * Copyright (c) 2006 Reimar Doeffinger.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "avformat.h"
20#include "avi.h"
21
22typedef struct {
23 int v_id;
24 int a_id;
25} NUVContext;
26
27typedef enum {
28 NUV_VIDEO = 'V',
29 NUV_EXTRADATA = 'D',
30 NUV_AUDIO = 'A',
31 NUV_SEEKP = 'R',
32 NUV_MYTHEXT = 'X'
33} frametype_t;
34
35static int nuv_probe(AVProbeData *p) {
36 if (p->buf_size < 12)
37 return 0;
38 if (!memcmp(p->buf, "NuppelVideo", 12))
39 return AVPROBE_SCORE_MAX;
40 if (!memcmp(p->buf, "MythTVVideo", 12))
41 return AVPROBE_SCORE_MAX;
42 return 0;
43}
44
45//! little macro to sanitize packet size
46#define PKTSIZE(s) (s & 0xffffff)
47
48/**
49 * \brief read until we found all data needed for decoding
50 * \param vst video stream of which to change parameters
51 * \param ast video stream of which to change parameters
52 * \param myth set if this is a MythTVVideo format file
53 * \return 1 if all required codec data was found
54 */
55static int get_codec_data(ByteIOContext *pb, AVStream *vst,
56 AVStream *ast, int myth) {
57 frametype_t frametype;
58 if (!vst && !myth)
59 return 1; // no codec data needed
60 while (!url_feof(pb)) {
61 int size, subtype;
62 frametype = get_byte(pb);
63 switch (frametype) {
64 case NUV_EXTRADATA:
65 subtype = get_byte(pb);
66 url_fskip(pb, 6);
67 size = PKTSIZE(get_le32(pb));
68 if (vst && subtype == 'R') {
69 vst->codec->extradata_size = size;
70 vst->codec->extradata = av_malloc(size);
71 get_buffer(pb, vst->codec->extradata, size);
72 size = 0;
73 if (!myth)
74 return 1;
75 }
76 break;
77 case NUV_MYTHEXT:
78 url_fskip(pb, 7);
79 size = PKTSIZE(get_le32(pb));
80 if (size != 128 * 4)
81 break;
82 get_le32(pb); // version
83 if (vst) {
84 vst->codec->codec_tag = get_le32(pb);
85 vst->codec->codec_id =
86 codec_get_id(codec_bmp_tags, vst->codec->codec_tag);
87 } else
88 url_fskip(pb, 4);
89
90 if (ast) {
91 ast->codec->codec_tag = get_le32(pb);
92 ast->codec->sample_rate = get_le32(pb);
93 ast->codec->bits_per_sample = get_le32(pb);
94 ast->codec->channels = get_le32(pb);
95 ast->codec->codec_id =
96 wav_codec_get_id(ast->codec->codec_tag,
97 ast->codec->bits_per_sample);
98 } else
99 url_fskip(pb, 4 * 4);
100
101 size -= 6 * 4;
102 url_fskip(pb, size);
103 return 1;
104 case NUV_SEEKP:
105 size = 11;
106 break;
107 default:
108 url_fskip(pb, 7);
109 size = PKTSIZE(get_le32(pb));
110 break;
111 }
112 url_fskip(pb, size);
113 }
114 return 0;
115}
116
117static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
118 NUVContext *ctx = (NUVContext *)s->priv_data;
119 ByteIOContext *pb = &s->pb;
120 char id_string[12], version_string[5];
121 double aspect, fps;
122 int is_mythtv, width, height, v_packs, a_packs;
123 int stream_nr = 0;
124 AVStream *vst = NULL, *ast = NULL;
125 get_buffer(pb, id_string, 12);
126 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
127 get_buffer(pb, version_string, 5);
128 url_fskip(pb, 3); // padding
129 width = get_le32(pb);
130 height = get_le32(pb);
131 get_le32(pb); // unused, "desiredwidth"
132 get_le32(pb); // unused, "desiredheight"
133 get_byte(pb); // 'P' == progressive, 'I' == interlaced
134 url_fskip(pb, 3); // padding
135 aspect = av_int2dbl(get_le64(pb));
136 fps = av_int2dbl(get_le64(pb));
137
138 // number of packets per stream type, -1 means unknown, e.g. streaming
139 v_packs = get_le32(pb);
140 a_packs = get_le32(pb);
141 get_le32(pb); // text
142
143 get_le32(pb); // keyframe distance (?)
144
145 if (v_packs) {
146 ctx->v_id = stream_nr++;
147 vst = av_new_stream(s, ctx->v_id);
148 vst->codec->codec_type = CODEC_TYPE_VIDEO;
149 vst->codec->codec_id = CODEC_ID_NUV;
150 vst->codec->codec_tag = MKTAG('R', 'J', 'P', 'G');
151 vst->codec->width = width;
152 vst->codec->height = height;
153 vst->codec->bits_per_sample = 10;
154 vst->codec->sample_aspect_ratio = av_d2q(aspect, 10000);
155 vst->r_frame_rate = av_d2q(1.0 / fps, 10000);
156 av_set_pts_info(vst, 32, 1, 1000);
157 } else
158 ctx->v_id = -1;
159
160 if (a_packs) {
161 ctx->a_id = stream_nr++;
162 ast = av_new_stream(s, ctx->a_id);
163 ast->codec->codec_type = CODEC_TYPE_AUDIO;
164 ast->codec->codec_id = CODEC_ID_PCM_S16LE;
165 ast->codec->channels = 2;
166 ast->codec->sample_rate = 44100;
167 ast->codec->bit_rate = 2 * 2 * 44100 * 8;
168 ast->codec->block_align = 2 * 2;
169 ast->codec->bits_per_sample = 16;
170 av_set_pts_info(ast, 32, 1, 1000);
171 } else
172 ctx->a_id = -1;
173
174 get_codec_data(pb, vst, ast, is_mythtv);
175 return 0;
176}
177
178#define HDRSIZE 12
179
180static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
181 NUVContext *ctx = (NUVContext *)s->priv_data;
182 ByteIOContext *pb = &s->pb;
183 uint8_t hdr[HDRSIZE];
184 frametype_t frametype;
185 int ret, size;
186 while (!url_feof(pb)) {
187 ret = get_buffer(pb, hdr, HDRSIZE);
188 if (ret <= 0)
189 return ret ? ret : -1;
190 frametype = hdr[0];
191 size = PKTSIZE(LE_32(&hdr[8]));
192 switch (frametype) {
193 case NUV_VIDEO:
194 case NUV_EXTRADATA:
195 if (ctx->v_id < 0) {
196 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
197 url_fskip(pb, size);
198 break;
199 }
200 ret = av_new_packet(pkt, HDRSIZE + size);
201 if (ret < 0)
202 return ret;
203 pkt->pos = url_ftell(pb);
204 pkt->pts = LE_32(&hdr[4]);
205 pkt->stream_index = ctx->v_id;
206 memcpy(pkt->data, hdr, HDRSIZE);
207 ret = get_buffer(pb, pkt->data + HDRSIZE, size);
208 return ret;
209 case NUV_AUDIO:
210 if (ctx->a_id < 0) {
211 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
212 url_fskip(pb, size);
213 break;
214 }
215 ret = av_get_packet(pb, pkt, size);
216 pkt->pts = LE_32(&hdr[4]);
217 pkt->stream_index = ctx->a_id;
218 return ret;
219 case NUV_SEEKP:
220 // contains no data, size value is invalid
221 break;
222 default:
223 url_fskip(pb, size);
224 break;
225 }
226 }
227 return AVERROR_IO;
228}
229
230static AVInputFormat nuv_demuxer = {
231 "nuv",
232 "NuppelVideo format",
233 sizeof(NUVContext),
234 nuv_probe,
235 nuv_header,
236 nuv_packet,
237 NULL,
238 NULL,
239};
240
241int nuv_init(void) {
242 av_register_input_format(&nuv_demuxer);
243 return 0;
244}
245
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