| 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/parseutils.h" |
| 23 | #include "libavutil/pixdesc.h" |
| 24 | #include "libavutil/opt.h" |
| 25 | #include "internal.h" |
| 26 | #include "avformat.h" |
| 27 | |
| 28 | typedef struct RawVideoDemuxerContext { |
| 29 | const AVClass *class; /**< Class for private options. */ |
| 30 | int width, height; /**< Integers describing video size, set by a private option. */ |
| 31 | char *pixel_format; /**< Set by a private option. */ |
| 32 | AVRational framerate; /**< AVRational describing framerate, set by a private option. */ |
| 33 | } RawVideoDemuxerContext; |
| 34 | |
| 35 | |
| 36 | static int rawvideo_read_header(AVFormatContext *ctx) |
| 37 | { |
| 38 | RawVideoDemuxerContext *s = ctx->priv_data; |
| 39 | enum AVPixelFormat pix_fmt; |
| 40 | AVStream *st; |
| 41 | |
| 42 | st = avformat_new_stream(ctx, NULL); |
| 43 | if (!st) |
| 44 | return AVERROR(ENOMEM); |
| 45 | |
| 46 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 47 | |
| 48 | st->codec->codec_id = ctx->iformat->raw_codec_id; |
| 49 | |
| 50 | if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) { |
| 51 | av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n", |
| 52 | s->pixel_format); |
| 53 | return AVERROR(EINVAL); |
| 54 | } |
| 55 | |
| 56 | avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num); |
| 57 | |
| 58 | st->codec->width = s->width; |
| 59 | st->codec->height = s->height; |
| 60 | st->codec->pix_fmt = pix_fmt; |
| 61 | st->codec->bit_rate = av_rescale_q(avpicture_get_size(st->codec->pix_fmt, s->width, s->height), |
| 62 | (AVRational){8,1}, st->time_base); |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | |
| 68 | static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 69 | { |
| 70 | int packet_size, ret, width, height; |
| 71 | AVStream *st = s->streams[0]; |
| 72 | |
| 73 | width = st->codec->width; |
| 74 | height = st->codec->height; |
| 75 | |
| 76 | packet_size = avpicture_get_size(st->codec->pix_fmt, width, height); |
| 77 | if (packet_size < 0) |
| 78 | return -1; |
| 79 | |
| 80 | ret = av_get_packet(s->pb, pkt, packet_size); |
| 81 | pkt->pts = pkt->dts = pkt->pos / packet_size; |
| 82 | |
| 83 | pkt->stream_index = 0; |
| 84 | if (ret < 0) |
| 85 | return ret; |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | #define OFFSET(x) offsetof(RawVideoDemuxerContext, x) |
| 90 | #define DEC AV_OPT_FLAG_DECODING_PARAM |
| 91 | static const AVOption rawvideo_options[] = { |
| 92 | { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, |
| 93 | { "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC }, |
| 94 | { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC }, |
| 95 | { NULL }, |
| 96 | }; |
| 97 | |
| 98 | static const AVClass rawvideo_demuxer_class = { |
| 99 | .class_name = "rawvideo demuxer", |
| 100 | .item_name = av_default_item_name, |
| 101 | .option = rawvideo_options, |
| 102 | .version = LIBAVUTIL_VERSION_INT, |
| 103 | }; |
| 104 | |
| 105 | AVInputFormat ff_rawvideo_demuxer = { |
| 106 | .name = "rawvideo", |
| 107 | .long_name = NULL_IF_CONFIG_SMALL("raw video"), |
| 108 | .priv_data_size = sizeof(RawVideoDemuxerContext), |
| 109 | .read_header = rawvideo_read_header, |
| 110 | .read_packet = rawvideo_read_packet, |
| 111 | .flags = AVFMT_GENERIC_INDEX, |
| 112 | .extensions = "yuv,cif,qcif,rgb", |
| 113 | .raw_codec_id = AV_CODEC_ID_RAWVIDEO, |
| 114 | .priv_class = &rawvideo_demuxer_class, |
| 115 | }; |