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