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 #if FF_API_FORMAT_PARAMETERS
  53             if (ap->sample_rate)
  54                 st->codec->sample_rate = ap->sample_rate;
  55             if (ap->channels)
  56                 st->codec->channels    = ap->channels;
  57             else st->codec->channels   = 1;
  58 #endif
  59
  60             if (s1->sample_rate)
  61                 st->codec->sample_rate = s1->sample_rate;
  62             if (s1->channels)
  63                 st->codec->channels    = s1->channels;
  64
  65             st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
  66             assert(st->codec->bits_per_coded_sample > 0);
  67             st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;
  68             av_set_pts_info(st, 64, 1, st->codec->sample_rate);
  69             break;
  70             }
  71         case AVMEDIA_TYPE_VIDEO: {
  72             FFRawVideoDemuxerContext *s1 = s->priv_data;
  73             int width = 0, height = 0, ret;
  74             enum PixelFormat pix_fmt;
  75
  76             if(ap->time_base.num)
  77                 av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
  78             else
  79                 av_set_pts_info(st, 64, 1, 25);
  80             if (s1->video_size && (ret = av_parse_video_size(&width, &height, s1->video_size)) < 0) {
  81                 av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
  82                 goto fail;
  83             }
  84             if ((pix_fmt = av_get_pix_fmt(s1->pixel_format)) == PIX_FMT_NONE) {
  85                 av_log(s, AV_LOG_ERROR, "No such pixel format: %s.\n", s1->pixel_format);
  86                 ret = AVERROR(EINVAL);
  87                 goto fail;
  88             }
  89 #if FF_API_FORMAT_PARAMETERS
  90             if (ap->width > 0)
  91                 width = ap->width;
  92             if (ap->height > 0)
  93                 height = ap->height;
  94             if (ap->pix_fmt)
  95                 pix_fmt = ap->pix_fmt;
  96 #endif
  97             st->codec->width  = width;
  98             st->codec->height = height;
  99             st->codec->pix_fmt = pix_fmt;
 100 fail:
 101             av_freep(&s1->video_size);
 102             av_freep(&s1->pixel_format);
 103             return ret;
 104             }
 105         default:
 106             return -1;
 107         }
 108     return 0;
 109 }
 110
 111 #define RAW_PACKET_SIZE 1024
 112
 113 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
 114 {
 115     int ret, size;
 116
 117     size = RAW_PACKET_SIZE;
 118
 119     if (av_new_packet(pkt, size) < 0)
 120         return AVERROR(ENOMEM);
 121
 122     pkt->pos= avio_tell(s->pb);
 123     pkt->stream_index = 0;
 124     ret = ffio_read_partial(s->pb, pkt->data, size);
 125     if (ret < 0) {
 126         av_free_packet(pkt);
 127         return ret;
 128     }
 129     pkt->size = ret;
 130     return ret;
 131 }
 132
 133 int ff_raw_audio_read_header(AVFormatContext *s,
 134                              AVFormatParameters *ap)
 135 {
 136     AVStream *st = av_new_stream(s, 0);
 137     if (!st)
 138         return AVERROR(ENOMEM);
 139     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 140     st->codec->codec_id = s->iformat->value;
 141     st->need_parsing = AVSTREAM_PARSE_FULL;
 142     /* the parameters will be extracted from the compressed bitstream */
 143
 144     return 0;
 145 }
 146
 147 /* MPEG-1/H.263 input */
 148 int ff_raw_video_read_header(AVFormatContext *s,
 149                              AVFormatParameters *ap)
 150 {
 151     AVStream *st;
 152
 153     st = av_new_stream(s, 0);
 154     if (!st)
 155         return AVERROR(ENOMEM);
 156
 157     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 158     st->codec->codec_id = s->iformat->value;
 159     st->need_parsing = AVSTREAM_PARSE_FULL;
 160
 161     /* for MJPEG, specify frame rate */
 162     /* for MPEG-4 specify it, too (most MPEG-4 streams do not have the fixed_vop_rate set ...)*/
 163     if (ap->time_base.num) {
 164         st->codec->time_base= ap->time_base;
 165     } else if ( st->codec->codec_id == CODEC_ID_MJPEG ||
 166                 st->codec->codec_id == CODEC_ID_MPEG4 ||
 167                 st->codec->codec_id == CODEC_ID_DIRAC ||
 168                 st->codec->codec_id == CODEC_ID_DNXHD ||
 169                 st->codec->codec_id == CODEC_ID_VC1   ||
 170                 st->codec->codec_id == CODEC_ID_H264) {
 171         st->codec->time_base= (AVRational){1,25};
 172     }
 173     av_set_pts_info(st, 64, 1, 1200000);
 174
 175     return 0;
 176 }
 177
 178 /* Note: Do not forget to add new entries to the Makefile as well. */
 179
 180 static const AVOption audio_options[] = {
 181     { "sample_rate", "", offsetof(RawAudioDemuxerContext, sample_rate), FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 182     { "channels",    "", offsetof(RawAudioDemuxerContext, channels),    FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 183     { NULL },
 184 };
 185
 186 const AVClass ff_rawaudio_demuxer_class = {
 187     .class_name     = "rawaudio demuxer",
 188     .item_name      = av_default_item_name,
 189     .option         = audio_options,
 190     .version        = LIBAVUTIL_VERSION_INT,
 191 };
 192
 193 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
 194 #define DEC AV_OPT_FLAG_DECODING_PARAM
 195 static const AVOption video_options[] = {
 196     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), FF_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
 197     { "pixel_format", "", OFFSET(pixel_format), FF_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
 198     { NULL },
 199 };
 200 #undef OFFSET
 201 #undef DEC
 202
 203 const AVClass ff_rawvideo_demuxer_class = {
 204     .class_name     = "rawvideo demuxer",
 205     .item_name      = av_default_item_name,
 206     .option         = video_options,
 207     .version        = LIBAVUTIL_VERSION_INT,
 208 };
 209
 210 #if CONFIG_G722_DEMUXER
 211 AVInputFormat ff_g722_demuxer = {
 212     "g722",
 213     NULL_IF_CONFIG_SMALL("raw G.722"),
 214     sizeof(RawAudioDemuxerContext),
 215     NULL,
 216     ff_raw_read_header,
 217     ff_raw_read_partial_packet,
 218     .flags= AVFMT_GENERIC_INDEX,
 219     .extensions = "g722,722",
 220     .value = CODEC_ID_ADPCM_G722,
 221     .priv_class = &ff_rawaudio_demuxer_class,
 222 };
 223 #endif
 224
 225 #if CONFIG_GSM_DEMUXER
 226 AVInputFormat ff_gsm_demuxer = {
 227     "gsm",
 228     NULL_IF_CONFIG_SMALL("raw GSM"),
 229     0,
 230     NULL,
 231     ff_raw_audio_read_header,
 232     ff_raw_read_partial_packet,
 233     .flags= AVFMT_GENERIC_INDEX,
 234     .extensions = "gsm",
 235     .value = CODEC_ID_GSM,
 236 };
 237 #endif
 238
 239 #if CONFIG_MJPEG_DEMUXER
 240 FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg", CODEC_ID_MJPEG)
 241 #endif
 242
 243 #if CONFIG_MLP_DEMUXER
 244 AVInputFormat ff_mlp_demuxer = {
 245     "mlp",
 246     NULL_IF_CONFIG_SMALL("raw MLP"),
 247     0,
 248     NULL,
 249     ff_raw_audio_read_header,
 250     ff_raw_read_partial_packet,
 251     .flags= AVFMT_GENERIC_INDEX,
 252     .extensions = "mlp",
 253     .value = CODEC_ID_MLP,
 254 };
 255 #endif
 256
 257 #if CONFIG_TRUEHD_DEMUXER
 258 AVInputFormat ff_truehd_demuxer = {
 259     "truehd",
 260     NULL_IF_CONFIG_SMALL("raw TrueHD"),
 261     0,
 262     NULL,
 263     ff_raw_audio_read_header,
 264     ff_raw_read_partial_packet,
 265     .flags= AVFMT_GENERIC_INDEX,
 266     .extensions = "thd",
 267     .value = CODEC_ID_TRUEHD,
 268 };
 269 #endif
 270
 271 #if CONFIG_SHORTEN_DEMUXER
 272 AVInputFormat ff_shorten_demuxer = {
 273     "shn",
 274     NULL_IF_CONFIG_SMALL("raw Shorten"),
 275     0,
 276     NULL,
 277     ff_raw_audio_read_header,
 278     ff_raw_read_partial_packet,
 279     .flags= AVFMT_GENERIC_INDEX,
 280     .extensions = "shn",
 281     .value = CODEC_ID_SHORTEN,
 282 };
 283 #endif
 284
 285 #if CONFIG_VC1_DEMUXER
 286 FF_DEF_RAWVIDEO_DEMUXER(vc1, "raw VC-1", NULL, "vc1", CODEC_ID_VC1)
 287 #endif