FFmpeg: libavformat/nuv.c Source File

00001 /*
00002  * NuppelVideo demuxer.
00003  * Copyright (c) 2006 Reimar Doeffinger
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/intreadwrite.h"
00023 #include "libavutil/intfloat.h"
00024 #include "avformat.h"
00025 #include "internal.h"
00026 #include "riff.h"
00027 
00028 typedef struct {
00029     int v_id;
00030     int a_id;
00031     int rtjpg_video;
00032 } NUVContext;
00033 
00034 typedef enum {
00035     NUV_VIDEO = 'V',
00036     NUV_EXTRADATA = 'D',
00037     NUV_AUDIO = 'A',
00038     NUV_SEEKP = 'R',
00039     NUV_MYTHEXT = 'X'
00040 } nuv_frametype;
00041 
00042 static int nuv_probe(AVProbeData *p) {
00043     if (!memcmp(p->buf, "NuppelVideo", 12))
00044         return AVPROBE_SCORE_MAX;
00045     if (!memcmp(p->buf, "MythTVVideo", 12))
00046         return AVPROBE_SCORE_MAX;
00047     return 0;
00048 }
00049 
00051 #define PKTSIZE(s) (s &  0xffffff)
00052 
00060 static int get_codec_data(AVIOContext *pb, AVStream *vst,
00061                           AVStream *ast, int myth) {
00062     nuv_frametype frametype;
00063     if (!vst && !myth)
00064         return 1; // no codec data needed
00065     while (!url_feof(pb)) {
00066         int size, subtype;
00067         frametype = avio_r8(pb);
00068         switch (frametype) {
00069             case NUV_EXTRADATA:
00070                 subtype = avio_r8(pb);
00071                 avio_skip(pb, 6);
00072                 size = PKTSIZE(avio_rl32(pb));
00073                 if (vst && subtype == 'R') {
00074                     vst->codec->extradata_size = size;
00075                     vst->codec->extradata = av_malloc(size);
00076                     avio_read(pb, vst->codec->extradata, size);
00077                     size = 0;
00078                     if (!myth)
00079                         return 1;
00080                 }
00081                 break;
00082             case NUV_MYTHEXT:
00083                 avio_skip(pb, 7);
00084                 size = PKTSIZE(avio_rl32(pb));
00085                 if (size != 128 * 4)
00086                     break;
00087                 avio_rl32(pb); // version
00088                 if (vst) {
00089                     vst->codec->codec_tag = avio_rl32(pb);
00090                     vst->codec->codec_id =
00091                         ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
00092                     if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
00093                         vst->codec->codec_id = CODEC_ID_NUV;
00094                 } else
00095                     avio_skip(pb, 4);
00096 
00097                 if (ast) {
00098                     ast->codec->codec_tag = avio_rl32(pb);
00099                     ast->codec->sample_rate = avio_rl32(pb);
00100                     ast->codec->bits_per_coded_sample = avio_rl32(pb);
00101                     ast->codec->channels = avio_rl32(pb);
00102                     ast->codec->codec_id =
00103                         ff_wav_codec_get_id(ast->codec->codec_tag,
00104                                          ast->codec->bits_per_coded_sample);
00105                     ast->need_parsing = AVSTREAM_PARSE_FULL;
00106                 } else
00107                     avio_skip(pb, 4 * 4);
00108 
00109                 size -= 6 * 4;
00110                 avio_skip(pb, size);
00111                 return 1;
00112             case NUV_SEEKP:
00113                 size = 11;
00114                 break;
00115             default:
00116                 avio_skip(pb, 7);
00117                 size = PKTSIZE(avio_rl32(pb));
00118                 break;
00119         }
00120         avio_skip(pb, size);
00121     }
00122     return 0;
00123 }
00124 
00125 static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
00126     NUVContext *ctx = s->priv_data;
00127     AVIOContext *pb = s->pb;
00128     char id_string[12];
00129     double aspect, fps;
00130     int is_mythtv, width, height, v_packs, a_packs;
00131     int stream_nr = 0;
00132     AVStream *vst = NULL, *ast = NULL;
00133     avio_read(pb, id_string, 12);
00134     is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
00135     avio_skip(pb, 5); // version string
00136     avio_skip(pb, 3); // padding
00137     width = avio_rl32(pb);
00138     height = avio_rl32(pb);
00139     avio_rl32(pb); // unused, "desiredwidth"
00140     avio_rl32(pb); // unused, "desiredheight"
00141     avio_r8(pb); // 'P' == progressive, 'I' == interlaced
00142     avio_skip(pb, 3); // padding
00143     aspect = av_int2double(avio_rl64(pb));
00144     if (aspect > 0.9999 && aspect < 1.0001)
00145         aspect = 4.0 / 3.0;
00146     fps = av_int2double(avio_rl64(pb));
00147 
00148     // number of packets per stream type, -1 means unknown, e.g. streaming
00149     v_packs = avio_rl32(pb);
00150     a_packs = avio_rl32(pb);
00151     avio_rl32(pb); // text
00152 
00153     avio_rl32(pb); // keyframe distance (?)
00154 
00155     if (v_packs) {
00156         ctx->v_id = stream_nr++;
00157         vst = avformat_new_stream(s, NULL);
00158         if (!vst)
00159             return AVERROR(ENOMEM);
00160         vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00161         vst->codec->codec_id = CODEC_ID_NUV;
00162         vst->codec->width = width;
00163         vst->codec->height = height;
00164         vst->codec->bits_per_coded_sample = 10;
00165         vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
00166         vst->r_frame_rate = av_d2q(fps, 60000);
00167         avpriv_set_pts_info(vst, 32, 1, 1000);
00168     } else
00169         ctx->v_id = -1;
00170 
00171     if (a_packs) {
00172         ctx->a_id = stream_nr++;
00173         ast = avformat_new_stream(s, NULL);
00174         if (!ast)
00175             return AVERROR(ENOMEM);
00176         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00177         ast->codec->codec_id = CODEC_ID_PCM_S16LE;
00178         ast->codec->channels = 2;
00179         ast->codec->sample_rate = 44100;
00180         ast->codec->bit_rate = 2 * 2 * 44100 * 8;
00181         ast->codec->block_align = 2 * 2;
00182         ast->codec->bits_per_coded_sample = 16;
00183         avpriv_set_pts_info(ast, 32, 1, 1000);
00184     } else
00185         ctx->a_id = -1;
00186 
00187     get_codec_data(pb, vst, ast, is_mythtv);
00188     ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV;
00189     return 0;
00190 }
00191 
00192 #define HDRSIZE 12
00193 
00194 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
00195     NUVContext *ctx = s->priv_data;
00196     AVIOContext *pb = s->pb;
00197     uint8_t hdr[HDRSIZE];
00198     nuv_frametype frametype;
00199     int ret, size;
00200     while (!url_feof(pb)) {
00201         int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
00202         uint64_t pos = avio_tell(pb);
00203         ret = avio_read(pb, hdr, HDRSIZE);
00204         if (ret < HDRSIZE)
00205             return ret < 0 ? ret : AVERROR(EIO);
00206         frametype = hdr[0];
00207         size = PKTSIZE(AV_RL32(&hdr[8]));
00208         switch (frametype) {
00209             case NUV_EXTRADATA:
00210                 if (!ctx->rtjpg_video) {
00211                     avio_skip(pb, size);
00212                     break;
00213                 }
00214             case NUV_VIDEO:
00215                 if (ctx->v_id < 0) {
00216                     av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
00217                     avio_skip(pb, size);
00218                     break;
00219                 }
00220                 ret = av_new_packet(pkt, copyhdrsize + size);
00221                 if (ret < 0)
00222                     return ret;
00223 
00224                 pkt->pos = pos;
00225                 pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
00226                 pkt->pts = AV_RL32(&hdr[4]);
00227                 pkt->stream_index = ctx->v_id;
00228                 memcpy(pkt->data, hdr, copyhdrsize);
00229                 ret = avio_read(pb, pkt->data + copyhdrsize, size);
00230                 if (ret < 0) {
00231                     av_free_packet(pkt);
00232                     return ret;
00233                 }
00234                 if (ret < size)
00235                     av_shrink_packet(pkt, copyhdrsize + ret);
00236                 return 0;
00237             case NUV_AUDIO:
00238                 if (ctx->a_id < 0) {
00239                     av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
00240                     avio_skip(pb, size);
00241                     break;
00242                 }
00243                 ret = av_get_packet(pb, pkt, size);
00244                 pkt->flags |= AV_PKT_FLAG_KEY;
00245                 pkt->pos = pos;
00246                 pkt->pts = AV_RL32(&hdr[4]);
00247                 pkt->stream_index = ctx->a_id;
00248                 if (ret < 0) return ret;
00249                 return 0;
00250             case NUV_SEEKP:
00251                 // contains no data, size value is invalid
00252                 break;
00253             default:
00254                 avio_skip(pb, size);
00255                 break;
00256         }
00257     }
00258     return AVERROR(EIO);
00259 }
00260 
00265 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
00266     AVIOContext *pb = s->pb;
00267     uint32_t tag = 0;
00268     while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
00269         tag = (tag << 8) | avio_r8(pb);
00270         if (tag                  == MKBETAG('R','T','j','j') &&
00271            (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
00272            (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
00273             return 1;
00274     }
00275     return 0;
00276 }
00277 
00282 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
00283                             int64_t *ppos, int64_t pos_limit)
00284 {
00285     NUVContext *ctx = s->priv_data;
00286     AVIOContext *pb = s->pb;
00287     uint8_t hdr[HDRSIZE];
00288     nuv_frametype frametype;
00289     int size, key, idx;
00290     int64_t pos, dts;
00291 
00292     if (avio_seek(pb, *ppos, SEEK_SET) < 0)
00293         return AV_NOPTS_VALUE;
00294 
00295     if (!nuv_resync(s, pos_limit))
00296         return AV_NOPTS_VALUE;
00297 
00298     while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
00299         if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
00300             return AV_NOPTS_VALUE;
00301         frametype = hdr[0];
00302         size = PKTSIZE(AV_RL32(&hdr[8]));
00303         switch (frametype) {
00304             case NUV_SEEKP:
00305                 break;
00306             case NUV_AUDIO:
00307             case NUV_VIDEO:
00308                 if (frametype == NUV_VIDEO) {
00309                     idx = ctx->v_id;
00310                     key = hdr[2] == 0;
00311                 } else {
00312                     idx = ctx->a_id;
00313                     key = 1;
00314                 }
00315                 if (stream_index == idx) {
00316 
00317                     pos = avio_tell(s->pb) - HDRSIZE;
00318                     dts = AV_RL32(&hdr[4]);
00319 
00320                     // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
00321                     av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
00322                             key ? AVINDEX_KEYFRAME : 0);
00323 
00324                     *ppos = pos;
00325                     return dts;
00326                 }
00327             default:
00328                 avio_skip(pb, size);
00329                 break;
00330         }
00331     }
00332     return AV_NOPTS_VALUE;
00333 }
00334 
00335 
00336 AVInputFormat ff_nuv_demuxer = {
00337     .name           = "nuv",
00338     .long_name      = NULL_IF_CONFIG_SMALL("NuppelVideo format"),
00339     .priv_data_size = sizeof(NUVContext),
00340     .read_probe     = nuv_probe,
00341     .read_header    = nuv_header,
00342     .read_packet    = nuv_packet,
00343     .read_timestamp = nuv_read_dts,
00344     .flags = AVFMT_GENERIC_INDEX,
00345 };