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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "avformat.h"
  24 #include "avio_internal.h"
  25 #include "rawdec.h"
  26 #include "libavutil/opt.h"
  27
  28 /* raw input */
  29 int ff_raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
  30 {
  31     AVStream *st;
  32     enum CodecID id;
  33
  34     st = av_new_stream(s, 0);
  35     if (!st)
  36         return AVERROR(ENOMEM);
  37
  38         id = s->iformat->value;
  39         if (id == CODEC_ID_RAWVIDEO) {
  40             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  41         } else {
  42             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  43         }
  44         st->codec->codec_id = id;
  45
  46         switch(st->codec->codec_type) {
  47         case AVMEDIA_TYPE_AUDIO: {
  48             RawAudioDemuxerContext *s1 = s->priv_data;
  49
  50 #if FF_API_FORMAT_PARAMETERS
  51             if (ap->sample_rate)
  52                 st->codec->sample_rate = ap->sample_rate;
  53             if (ap->channels)
  54                 st->codec->channels    = ap->channels;
  55             else st->codec->channels   = 1;
  56 #endif
  57
  58             if (s1->sample_rate)
  59                 st->codec->sample_rate = s1->sample_rate;
  60             if (s1->channels)
  61                 st->codec->channels    = s1->channels;
  62
  63             st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
  64             assert(st->codec->bits_per_coded_sample > 0);
  65             st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;
  66             av_set_pts_info(st, 64, 1, st->codec->sample_rate);
  67             break;
  68             }
  69         case AVMEDIA_TYPE_VIDEO:
  70             if(ap->time_base.num)
  71                 av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
  72             else
  73                 av_set_pts_info(st, 64, 1, 25);
  74             st->codec->width = ap->width;
  75             st->codec->height = ap->height;
  76             st->codec->pix_fmt = ap->pix_fmt;
  77             if(st->codec->pix_fmt == PIX_FMT_NONE)
  78                 st->codec->pix_fmt= PIX_FMT_YUV420P;
  79             break;
  80         default:
  81             return -1;
  82         }
  83     return 0;
  84 }
  85
  86 #define RAW_PACKET_SIZE 1024
  87
  88 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
  89 {
  90     int ret, size;
  91
  92     size = RAW_PACKET_SIZE;
  93
  94     if (av_new_packet(pkt, size) < 0)
  95         return AVERROR(ENOMEM);
  96
  97     pkt->pos= avio_tell(s->pb);
  98     pkt->stream_index = 0;
  99     ret = ffio_read_partial(s->pb, pkt->data, size);
 100     if (ret < 0) {
 101         av_free_packet(pkt);
 102         return ret;
 103     }
 104     pkt->size = ret;
 105     return ret;
 106 }
 107
 108 int ff_raw_audio_read_header(AVFormatContext *s,
 109                              AVFormatParameters *ap)
 110 {
 111     AVStream *st = av_new_stream(s, 0);
 112     if (!st)
 113         return AVERROR(ENOMEM);
 114     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 115     st->codec->codec_id = s->iformat->value;
 116     st->need_parsing = AVSTREAM_PARSE_FULL;
 117     /* the parameters will be extracted from the compressed bitstream */
 118
 119     return 0;
 120 }
 121
 122 /* MPEG-1/H.263 input */
 123 int ff_raw_video_read_header(AVFormatContext *s,
 124                              AVFormatParameters *ap)
 125 {
 126     AVStream *st;
 127
 128     st = av_new_stream(s, 0);
 129     if (!st)
 130         return AVERROR(ENOMEM);
 131
 132     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 133     st->codec->codec_id = s->iformat->value;
 134     st->need_parsing = AVSTREAM_PARSE_FULL;
 135
 136     /* for MJPEG, specify frame rate */
 137     /* for MPEG-4 specify it, too (most MPEG-4 streams do not have the fixed_vop_rate set ...)*/
 138     if (ap->time_base.num) {
 139         st->codec->time_base= ap->time_base;
 140     } else if ( st->codec->codec_id == CODEC_ID_MJPEG ||
 141                 st->codec->codec_id == CODEC_ID_MPEG4 ||
 142                 st->codec->codec_id == CODEC_ID_DIRAC ||
 143                 st->codec->codec_id == CODEC_ID_DNXHD ||
 144                 st->codec->codec_id == CODEC_ID_VC1   ||
 145                 st->codec->codec_id == CODEC_ID_H264) {
 146         st->codec->time_base= (AVRational){1,25};
 147     }
 148     av_set_pts_info(st, 64, 1, 1200000);
 149
 150     return 0;
 151 }
 152
 153 /* Note: Do not forget to add new entries to the Makefile as well. */
 154
 155 static const AVOption audio_options[] = {
 156     { "sample_rate", "", offsetof(RawAudioDemuxerContext, sample_rate), FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 157     { "channels",    "", offsetof(RawAudioDemuxerContext, channels),    FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 158     { NULL },
 159 };
 160
 161 const AVClass ff_rawaudio_demuxer_class = {
 162     .class_name     = "rawaudio demuxer",
 163     .item_name      = av_default_item_name,
 164     .option         = audio_options,
 165     .version        = LIBAVUTIL_VERSION_INT,
 166 };
 167
 168 #if CONFIG_G722_DEMUXER
 169 AVInputFormat ff_g722_demuxer = {
 170     "g722",
 171     NULL_IF_CONFIG_SMALL("raw G.722"),
 172     sizeof(RawAudioDemuxerContext),
 173     NULL,
 174     ff_raw_read_header,
 175     ff_raw_read_partial_packet,
 176     .flags= AVFMT_GENERIC_INDEX,
 177     .extensions = "g722,722",
 178     .value = CODEC_ID_ADPCM_G722,
 179     .priv_class = &ff_rawaudio_demuxer_class,
 180 };
 181 #endif
 182
 183 #if CONFIG_GSM_DEMUXER
 184 AVInputFormat ff_gsm_demuxer = {
 185     "gsm",
 186     NULL_IF_CONFIG_SMALL("raw GSM"),
 187     0,
 188     NULL,
 189     ff_raw_audio_read_header,
 190     ff_raw_read_partial_packet,
 191     .flags= AVFMT_GENERIC_INDEX,
 192     .extensions = "gsm",
 193     .value = CODEC_ID_GSM,
 194 };
 195 #endif
 196
 197 #if CONFIG_MJPEG_DEMUXER
 198 AVInputFormat ff_mjpeg_demuxer = {
 199     "mjpeg",
 200     NULL_IF_CONFIG_SMALL("raw MJPEG video"),
 201     0,
 202     NULL,
 203     ff_raw_video_read_header,
 204     ff_raw_read_partial_packet,
 205     .flags= AVFMT_GENERIC_INDEX,
 206     .extensions = "mjpg,mjpeg",
 207     .value = CODEC_ID_MJPEG,
 208 };
 209 #endif
 210
 211 #if CONFIG_MLP_DEMUXER
 212 AVInputFormat ff_mlp_demuxer = {
 213     "mlp",
 214     NULL_IF_CONFIG_SMALL("raw MLP"),
 215     0,
 216     NULL,
 217     ff_raw_audio_read_header,
 218     ff_raw_read_partial_packet,
 219     .flags= AVFMT_GENERIC_INDEX,
 220     .extensions = "mlp",
 221     .value = CODEC_ID_MLP,
 222 };
 223 #endif
 224
 225 #if CONFIG_TRUEHD_DEMUXER
 226 AVInputFormat ff_truehd_demuxer = {
 227     "truehd",
 228     NULL_IF_CONFIG_SMALL("raw TrueHD"),
 229     0,
 230     NULL,
 231     ff_raw_audio_read_header,
 232     ff_raw_read_partial_packet,
 233     .flags= AVFMT_GENERIC_INDEX,
 234     .extensions = "thd",
 235     .value = CODEC_ID_TRUEHD,
 236 };
 237 #endif
 238
 239 #if CONFIG_SHORTEN_DEMUXER
 240 AVInputFormat ff_shorten_demuxer = {
 241     "shn",
 242     NULL_IF_CONFIG_SMALL("raw Shorten"),
 243     0,
 244     NULL,
 245     ff_raw_audio_read_header,
 246     ff_raw_read_partial_packet,
 247     .flags= AVFMT_GENERIC_INDEX,
 248     .extensions = "shn",
 249     .value = CODEC_ID_SHORTEN,
 250 };
 251 #endif
 252
 253 #if CONFIG_VC1_DEMUXER
 254 AVInputFormat ff_vc1_demuxer = {
 255     "vc1",
 256     NULL_IF_CONFIG_SMALL("raw VC-1"),
 257     0,
 258     NULL /* vc1_probe */,
 259     ff_raw_video_read_header,
 260     ff_raw_read_partial_packet,
 261     .extensions = "vc1",
 262     .value = CODEC_ID_VC1,
 263 };
 264 #endif