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 #include "libavutil/parseutils.h"
  28 #include "libavutil/pixdesc.h"
  29
  30 /* raw input */
  31 int ff_raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
  32 {
  33     AVStream *st;
  34     enum CodecID id;
  35
  36     st = av_new_stream(s, 0);
  37     if (!st)
  38         return AVERROR(ENOMEM);
  39
  40         id = s->iformat->value;
  41         if (id == CODEC_ID_RAWVIDEO) {
  42             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  43         } else {
  44             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  45         }
  46         st->codec->codec_id = id;
  47
  48         switch(st->codec->codec_type) {
  49         case AVMEDIA_TYPE_AUDIO: {
  50             RawAudioDemuxerContext *s1 = s->priv_data;
  51
  52             st->codec->channels = 1;
  53
  54             if (id == CODEC_ID_ADPCM_G722)
  55                 st->codec->sample_rate = 16000;
  56
  57             if (s1 && s1->sample_rate)
  58                 st->codec->sample_rate = s1->sample_rate;
  59             if (s1 && s1->channels)
  60                 st->codec->channels    = s1->channels;
  61
  62             st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
  63             assert(st->codec->bits_per_coded_sample > 0);
  64             st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;
  65             av_set_pts_info(st, 64, 1, st->codec->sample_rate);
  66             break;
  67             }
  68         case AVMEDIA_TYPE_VIDEO: {
  69             FFRawVideoDemuxerContext *s1 = s->priv_data;
  70             int width = 0, height = 0, ret = 0;
  71             enum PixelFormat pix_fmt;
  72             AVRational framerate;
  73
  74             if (s1->video_size && (ret = av_parse_video_size(&width, &height, s1->video_size)) < 0) {
  75                 av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
  76                 goto fail;
  77             }
  78             if ((pix_fmt = av_get_pix_fmt(s1->pixel_format)) == PIX_FMT_NONE) {
  79                 av_log(s, AV_LOG_ERROR, "No such pixel format: %s.\n", s1->pixel_format);
  80                 ret = AVERROR(EINVAL);
  81                 goto fail;
  82             }
  83             if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
  84                 av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
  85                 goto fail;
  86             }
  87             av_set_pts_info(st, 64, framerate.den, framerate.num);
  88             st->codec->width  = width;
  89             st->codec->height = height;
  90             st->codec->pix_fmt = pix_fmt;
  91 fail:
  92             return ret;
  93             }
  94         default:
  95             return -1;
  96         }
  97     return 0;
  98 }
  99
 100 #define RAW_PACKET_SIZE 1024
 101
 102 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
 103 {
 104     int ret, size;
 105
 106     size = RAW_PACKET_SIZE;
 107
 108     if (av_new_packet(pkt, size) < 0)
 109         return AVERROR(ENOMEM);
 110
 111     pkt->pos= avio_tell(s->pb);
 112     pkt->stream_index = 0;
 113     ret = ffio_read_partial(s->pb, pkt->data, size);
 114     if (ret < 0) {
 115         av_free_packet(pkt);
 116         return ret;
 117     }
 118     pkt->size = ret;
 119     return ret;
 120 }
 121
 122 int ff_raw_audio_read_header(AVFormatContext *s,
 123                              AVFormatParameters *ap)
 124 {
 125     AVStream *st = av_new_stream(s, 0);
 126     if (!st)
 127         return AVERROR(ENOMEM);
 128     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 129     st->codec->codec_id = s->iformat->value;
 130     st->need_parsing = AVSTREAM_PARSE_FULL;
 131     /* the parameters will be extracted from the compressed bitstream */
 132
 133     return 0;
 134 }
 135
 136 /* MPEG-1/H.263 input */
 137 int ff_raw_video_read_header(AVFormatContext *s,
 138                              AVFormatParameters *ap)
 139 {
 140     AVStream *st;
 141     FFRawVideoDemuxerContext *s1 = s->priv_data;
 142     AVRational framerate;
 143     int ret = 0;
 144
 145
 146     st = av_new_stream(s, 0);
 147     if (!st) {
 148         ret = AVERROR(ENOMEM);
 149         goto fail;
 150     }
 151
 152     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 153     st->codec->codec_id = s->iformat->value;
 154     st->need_parsing = AVSTREAM_PARSE_FULL;
 155
 156     if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
 157         av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
 158         goto fail;
 159     }
 160
 161     st->codec->time_base = (AVRational){framerate.den, framerate.num};
 162     av_set_pts_info(st, 64, 1, 1200000);
 163
 164 fail:
 165     return ret;
 166 }
 167
 168 /* Note: Do not forget to add new entries to the Makefile as well. */
 169
 170 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
 171 #define DEC AV_OPT_FLAG_DECODING_PARAM
 172 static const AVOption video_options[] = {
 173     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), FF_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
 174     { "pixel_format", "", OFFSET(pixel_format), FF_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
 175     { "framerate", "", OFFSET(framerate), FF_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
 176     { NULL },
 177 };
 178 #undef OFFSET
 179 #undef DEC
 180
 181 const AVClass ff_rawvideo_demuxer_class = {
 182     .class_name     = "rawvideo demuxer",
 183     .item_name      = av_default_item_name,
 184     .option         = video_options,
 185     .version        = LIBAVUTIL_VERSION_INT,
 186 };
 187
 188 #if CONFIG_G722_DEMUXER
 189 AVInputFormat ff_g722_demuxer = {
 190     .name           = "g722",
 191     .long_name      = NULL_IF_CONFIG_SMALL("raw G.722"),
 192     .read_header    = ff_raw_read_header,
 193     .read_packet    = ff_raw_read_partial_packet,
 194     .flags= AVFMT_GENERIC_INDEX,
 195     .extensions = "g722,722",
 196     .value = CODEC_ID_ADPCM_G722,
 197 };
 198 #endif
 199
 200 #if CONFIG_GSM_DEMUXER
 201 AVInputFormat ff_gsm_demuxer = {
 202     .name           = "gsm",
 203     .long_name      = NULL_IF_CONFIG_SMALL("raw GSM"),
 204     .read_header    = ff_raw_audio_read_header,
 205     .read_packet    = ff_raw_read_partial_packet,
 206     .flags= AVFMT_GENERIC_INDEX,
 207     .extensions = "gsm",
 208     .value = CODEC_ID_GSM,
 209 };
 210 #endif
 211
 212 #if CONFIG_MJPEG_DEMUXER
 213 FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg", CODEC_ID_MJPEG)
 214 #endif
 215
 216 #if CONFIG_MLP_DEMUXER
 217 AVInputFormat ff_mlp_demuxer = {
 218     .name           = "mlp",
 219     .long_name      = NULL_IF_CONFIG_SMALL("raw MLP"),
 220     .read_header    = ff_raw_audio_read_header,
 221     .read_packet    = ff_raw_read_partial_packet,
 222     .flags= AVFMT_GENERIC_INDEX,
 223     .extensions = "mlp",
 224     .value = CODEC_ID_MLP,
 225 };
 226 #endif
 227
 228 #if CONFIG_TRUEHD_DEMUXER
 229 AVInputFormat ff_truehd_demuxer = {
 230     .name           = "truehd",
 231     .long_name      = NULL_IF_CONFIG_SMALL("raw TrueHD"),
 232     .read_header    = ff_raw_audio_read_header,
 233     .read_packet    = ff_raw_read_partial_packet,
 234     .flags= AVFMT_GENERIC_INDEX,
 235     .extensions = "thd",
 236     .value = CODEC_ID_TRUEHD,
 237 };
 238 #endif
 239
 240 #if CONFIG_SHORTEN_DEMUXER
 241 AVInputFormat ff_shorten_demuxer = {
 242     .name           = "shn",
 243     .long_name      = NULL_IF_CONFIG_SMALL("raw Shorten"),
 244     .read_header    = ff_raw_audio_read_header,
 245     .read_packet    = ff_raw_read_partial_packet,
 246     .flags= AVFMT_GENERIC_INDEX,
 247     .extensions = "shn",
 248     .value = CODEC_ID_SHORTEN,
 249 };
 250 #endif
 251
 252 #if CONFIG_VC1_DEMUXER
 253 FF_DEF_RAWVIDEO_DEMUXER(vc1, "raw VC-1", NULL, "vc1", CODEC_ID_VC1)
 254 #endif