diff options
Diffstat (limited to 'ffmpeg/libavformat/rawvideodec.c')
| -rw-r--r-- | ffmpeg/libavformat/rawvideodec.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/rawvideodec.c b/ffmpeg/libavformat/rawvideodec.c new file mode 100644 index 0000000..8460781 --- /dev/null +++ b/ffmpeg/libavformat/rawvideodec.c @@ -0,0 +1,129 @@ +/* + * RAW video demuxer + * Copyright (c) 2001 Fabrice Bellard + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/parseutils.h" +#include "libavutil/pixdesc.h" +#include "libavutil/opt.h" +#include "internal.h" +#include "avformat.h" + +typedef struct RawVideoDemuxerContext { + const AVClass *class; /**< Class for private options. */ + char *video_size; /**< String describing video size, set by a private option. */ + char *pixel_format; /**< Set by a private option. */ + char *framerate; /**< String describing framerate, set by a private option. */ +} RawVideoDemuxerContext; + + +static int rawvideo_read_header(AVFormatContext *ctx) +{ + RawVideoDemuxerContext *s = ctx->priv_data; + int width = 0, height = 0, ret = 0; + enum AVPixelFormat pix_fmt; + AVRational framerate; + AVStream *st; + + st = avformat_new_stream(ctx, NULL); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + + st->codec->codec_id = ctx->iformat->raw_codec_id; + + if (s->video_size && + (ret = av_parse_video_size(&width, &height, s->video_size)) < 0) { + av_log(ctx, AV_LOG_ERROR, "Couldn't parse video size.\n"); + return ret; + } + + if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) { + av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n", + s->pixel_format); + return AVERROR(EINVAL); + } + + if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) { + av_log(ctx, AV_LOG_ERROR, "Could not parse framerate: %s.\n", + s->framerate); + return ret; + } + + avpriv_set_pts_info(st, 64, framerate.den, framerate.num); + + st->codec->width = width; + st->codec->height = height; + st->codec->pix_fmt = pix_fmt; + st->codec->bit_rate = av_rescale_q(avpicture_get_size(st->codec->pix_fmt, width, height), + (AVRational){8,1}, st->time_base); + + return 0; +} + + +static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int packet_size, ret, width, height; + AVStream *st = s->streams[0]; + + width = st->codec->width; + height = st->codec->height; + + packet_size = avpicture_get_size(st->codec->pix_fmt, width, height); + if (packet_size < 0) + return -1; + + ret = av_get_packet(s->pb, pkt, packet_size); + pkt->pts = pkt->dts = pkt->pos / packet_size; + + pkt->stream_index = 0; + if (ret < 0) + return ret; + return 0; +} + +#define OFFSET(x) offsetof(RawVideoDemuxerContext, x) +#define DEC AV_OPT_FLAG_DECODING_PARAM +static const AVOption rawvideo_options[] = { + { "video_size", "set frame size", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, + { "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC }, + { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC }, + { NULL }, +}; + +static const AVClass rawvideo_demuxer_class = { + .class_name = "rawvideo demuxer", + .item_name = av_default_item_name, + .option = rawvideo_options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_rawvideo_demuxer = { + .name = "rawvideo", + .long_name = NULL_IF_CONFIG_SMALL("raw video"), + .priv_data_size = sizeof(RawVideoDemuxerContext), + .read_header = rawvideo_read_header, + .read_packet = rawvideo_read_packet, + .flags = AVFMT_GENERIC_INDEX, + .extensions = "yuv,cif,qcif,rgb", + .raw_codec_id = AV_CODEC_ID_RAWVIDEO, + .priv_class = &rawvideo_demuxer_class, +}; |