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