libavformat/rawdec.c

   1 /*
   2  * RAW demuxers
   3  * Copyright (c) 2001 Fabrice Bellard
   4  * Copyright (c) 2005 Alex Beregszaszi
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config_components.h"
  24
  25 #include "avformat.h"
  26 #include "demux.h"
  27 #include "internal.h"
  28 #include "rawdec.h"
  29 #include "libavutil/opt.h"
  30
  31 #define RAW_PACKET_SIZE 1024
  32
  33 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
  34 {
  35     FFRawDemuxerContext *raw = s->priv_data;
  36     int ret, size;
  37
  38     size = raw->raw_packet_size;
  39
  40     if ((ret = av_new_packet(pkt, size)) < 0)
  41         return ret;
  42
  43     pkt->pos= avio_tell(s->pb);
  44     pkt->stream_index = 0;
  45     ret = avio_read_partial(s->pb, pkt->data, size);
  46     if (ret < 0) {
  47         av_packet_unref(pkt);
  48         return ret;
  49     }
  50     av_shrink_packet(pkt, ret);
  51     return ret;
  52 }
  53
  54 int ff_raw_audio_read_header(AVFormatContext *s)
  55 {
  56     AVStream *st = avformat_new_stream(s, NULL);
  57     if (!st)
  58         return AVERROR(ENOMEM);
  59     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
  60     st->codecpar->codec_id = ffifmt(s->iformat)->raw_codec_id;
  61     ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  62     st->start_time = 0;
  63     /* the parameters will be extracted from the compressed bitstream */
  64
  65     return 0;
  66 }
  67
  68 /* MPEG-1/H.263 input */
  69 int ff_raw_video_read_header(AVFormatContext *s)
  70 {
  71     AVStream *st;
  72     FFStream *sti;
  73     FFRawVideoDemuxerContext *s1 = s->priv_data;
  74     int ret = 0;
  75
  76
  77     st = avformat_new_stream(s, NULL);
  78     if (!st) {
  79         ret = AVERROR(ENOMEM);
  80         goto fail;
  81     }
  82     sti = ffstream(st);
  83
  84     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
  85     st->codecpar->codec_id = ffifmt(s->iformat)->raw_codec_id;
  86     sti->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  87
  88     st->avg_frame_rate = s1->framerate;
  89     avpriv_set_pts_info(st, 64, 1, 1200000);
  90
  91 fail:
  92     return ret;
  93 }
  94
  95 int ff_raw_subtitle_read_header(AVFormatContext *s)
  96 {
  97     AVStream *st = avformat_new_stream(s, NULL);
  98     if (!st)
  99         return AVERROR(ENOMEM);
 100     st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
 101     st->codecpar->codec_id = ffifmt(s->iformat)->raw_codec_id;
 102     st->start_time = 0;
 103     return 0;
 104 }
 105
 106 static int raw_data_read_header(AVFormatContext *s)
 107 {
 108     AVStream *st = avformat_new_stream(s, NULL);
 109     if (!st)
 110         return AVERROR(ENOMEM);
 111     st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
 112     st->codecpar->codec_id = ffifmt(s->iformat)->raw_codec_id;
 113     st->start_time = 0;
 114     return 0;
 115 }
 116
 117 /* Note: Do not forget to add new entries to the Makefile as well. */
 118
 119 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
 120 #define DEC AV_OPT_FLAG_DECODING_PARAM
 121 static const AVOption rawvideo_options[] = {
 122     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},
 123     { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
 124     { NULL },
 125 };
 126 #undef OFFSET
 127
 128 const AVClass ff_rawvideo_demuxer_class = {
 129     .class_name = "generic raw video demuxer",
 130     .item_name  = av_default_item_name,
 131     .option     = rawvideo_options,
 132     .version    = LIBAVUTIL_VERSION_INT,
 133 };
 134
 135 #define OFFSET(x) offsetof(FFRawDemuxerContext, x)
 136 static const AVOption raw_options[] = {
 137     { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
 138     { NULL },
 139 };
 140
 141 const AVClass ff_raw_demuxer_class = {
 142     .class_name = "generic raw demuxer",
 143     .item_name  = av_default_item_name,
 144     .option     = raw_options,
 145     .version    = LIBAVUTIL_VERSION_INT,
 146 };
 147
 148 #if CONFIG_DATA_DEMUXER
 149 const FFInputFormat ff_data_demuxer = {
 150     .p.name         = "data",
 151     .p.long_name    = NULL_IF_CONFIG_SMALL("raw data"),
 152     .p.flags        = AVFMT_NOTIMESTAMPS,
 153     .p.priv_class   = &ff_raw_demuxer_class,
 154     .read_header    = raw_data_read_header,
 155     .read_packet    = ff_raw_read_partial_packet,
 156     .raw_codec_id   = AV_CODEC_ID_NONE,
 157     .priv_data_size = sizeof(FFRawDemuxerContext),\
 158 };
 159 #endif
 160
 161 #if CONFIG_MJPEG_DEMUXER
 162 static int mjpeg_probe(const AVProbeData *p)
 163 {
 164     int i;
 165     int state = -1;
 166     int nb_invalid = 0;
 167     int nb_frames = 0;
 168
 169     for (i = 0; i < p->buf_size - 1; i++) {
 170         int c;
 171         if (p->buf[i] != 0xFF)
 172             continue;
 173         c = p->buf[i+1];
 174         switch (c) {
 175         case 0xD8:
 176             state = 0xD8;
 177             break;
 178         case 0xC0:
 179         case 0xC1:
 180         case 0xC2:
 181         case 0xC3:
 182         case 0xC5:
 183         case 0xC6:
 184         case 0xC7:
 185         case 0xF7:
 186             if (state == 0xD8) {
 187                 state = 0xC0;
 188             } else
 189                 nb_invalid++;
 190             break;
 191         case 0xDA:
 192             if (state == 0xC0) {
 193                 state = 0xDA;
 194             } else
 195                 nb_invalid++;
 196             break;
 197         case 0xD9:
 198             if (state == 0xDA) {
 199                 state = 0xD9;
 200                 nb_frames++;
 201             } else
 202                 nb_invalid++;
 203             break;
 204         default:
 205             if (  (c >= 0x02 && c <= 0xBF)
 206                 || c == 0xC8) {
 207                 nb_invalid++;
 208             }
 209         }
 210     }
 211
 212     if (nb_invalid*4 + 1 < nb_frames) {
 213         static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";
 214         int i;
 215
 216         for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)
 217             if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
 218                 return AVPROBE_SCORE_EXTENSION;
 219
 220         if (nb_invalid == 0 && nb_frames > 2)
 221             return AVPROBE_SCORE_EXTENSION / 2;
 222         return AVPROBE_SCORE_EXTENSION / 4;
 223     }
 224     if (!nb_invalid && nb_frames)
 225         return AVPROBE_SCORE_EXTENSION / 4;
 226
 227     return 0;
 228 }
 229
 230 FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
 231 #endif