libavformat/rawvideodec.c

   1 /*
   2  * RAW video demuxer
   3  * Copyright (c) 2001 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/imgutils.h"
  23 #include "libavutil/parseutils.h"
  24 #include "libavutil/pixdesc.h"
  25 #include "libavutil/opt.h"
  26 #include "internal.h"
  27 #include "avformat.h"
  28
  29 typedef struct RawVideoDemuxerContext {
  30     const AVClass *class;     /**< Class for private options. */
  31     int width, height;        /**< Integers describing video size, set by a private option. */
  32     char *pixel_format;       /**< Set by a private option. */
  33     AVRational framerate;     /**< AVRational describing framerate, set by a private option. */
  34 } RawVideoDemuxerContext;
  35
  36
  37 static int rawvideo_read_header(AVFormatContext *ctx)
  38 {
  39     RawVideoDemuxerContext *s = ctx->priv_data;
  40     enum AVPixelFormat pix_fmt;
  41     AVStream *st;
  42     int packet_size;
  43
  44     st = avformat_new_stream(ctx, NULL);
  45     if (!st)
  46         return AVERROR(ENOMEM);
  47
  48     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
  49
  50     st->codecpar->codec_id = ctx->iformat->raw_codec_id;
  51
  52     if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
  53         av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n",
  54                s->pixel_format);
  55         return AVERROR(EINVAL);
  56     }
  57
  58     avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
  59
  60     st->codecpar->width  = s->width;
  61     st->codecpar->height = s->height;
  62     st->codecpar->format = pix_fmt;
  63     packet_size = av_image_get_buffer_size(st->codecpar->format, s->width, s->height, 1);
  64     if (packet_size < 0)
  65         return packet_size;
  66     ctx->packet_size = packet_size;
  67     st->codecpar->bit_rate = av_rescale_q(ctx->packet_size,
  68                                        (AVRational){8,1}, st->time_base);
  69
  70     return 0;
  71 }
  72
  73
  74 static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
  75 {
  76     int ret;
  77
  78     ret = av_get_packet(s->pb, pkt, s->packet_size);
  79     pkt->pts = pkt->dts = pkt->pos / s->packet_size;
  80
  81     pkt->stream_index = 0;
  82     if (ret < 0)
  83         return ret;
  84     return 0;
  85 }
  86
  87 #define OFFSET(x) offsetof(RawVideoDemuxerContext, x)
  88 #define DEC AV_OPT_FLAG_DECODING_PARAM
  89 static const AVOption rawvideo_options[] = {
  90     { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
  91     { "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
  92     { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
  93     { NULL },
  94 };
  95
  96 static const AVClass rawvideo_demuxer_class = {
  97     .class_name = "rawvideo demuxer",
  98     .item_name  = av_default_item_name,
  99     .option     = rawvideo_options,
 100     .version    = LIBAVUTIL_VERSION_INT,
 101 };
 102
 103 AVInputFormat ff_rawvideo_demuxer = {
 104     .name           = "rawvideo",
 105     .long_name      = NULL_IF_CONFIG_SMALL("raw video"),
 106     .priv_data_size = sizeof(RawVideoDemuxerContext),
 107     .read_header    = rawvideo_read_header,
 108     .read_packet    = rawvideo_read_packet,
 109     .flags          = AVFMT_GENERIC_INDEX,
 110     .extensions     = "yuv,cif,qcif,rgb",
 111     .raw_codec_id   = AV_CODEC_ID_RAWVIDEO,
 112     .priv_class     = &rawvideo_demuxer_class,
 113 };