Libav 0.7.1
libavformat/rawdec.c
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00001 /*
00002  * RAW demuxers
00003  * Copyright (c) 2001 Fabrice Bellard
00004  * Copyright (c) 2005 Alex Beregszaszi
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "avformat.h"
00024 #include "avio_internal.h"
00025 #include "rawdec.h"
00026 #include "libavutil/opt.h"
00027 #include "libavutil/parseutils.h"
00028 #include "libavutil/pixdesc.h"
00029 
00030 /* raw input */
00031 int ff_raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
00032 {
00033     AVStream *st;
00034     enum CodecID id;
00035 
00036     st = av_new_stream(s, 0);
00037     if (!st)
00038         return AVERROR(ENOMEM);
00039 
00040         id = s->iformat->value;
00041         if (id == CODEC_ID_RAWVIDEO) {
00042             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00043         } else {
00044             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00045         }
00046         st->codec->codec_id = id;
00047 
00048         switch(st->codec->codec_type) {
00049         case AVMEDIA_TYPE_AUDIO: {
00050             RawAudioDemuxerContext *s1 = s->priv_data;
00051 
00052 #if FF_API_FORMAT_PARAMETERS
00053             if (ap->sample_rate)
00054                 st->codec->sample_rate = ap->sample_rate;
00055             if (ap->channels)
00056                 st->codec->channels    = ap->channels;
00057             else st->codec->channels   = 1;
00058 #endif
00059 
00060             if (s1->sample_rate)
00061                 st->codec->sample_rate = s1->sample_rate;
00062             if (s1->channels)
00063                 st->codec->channels    = s1->channels;
00064 
00065             st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
00066             assert(st->codec->bits_per_coded_sample > 0);
00067             st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;
00068             av_set_pts_info(st, 64, 1, st->codec->sample_rate);
00069             break;
00070             }
00071         case AVMEDIA_TYPE_VIDEO: {
00072             FFRawVideoDemuxerContext *s1 = s->priv_data;
00073             int width = 0, height = 0, ret = 0;
00074             enum PixelFormat pix_fmt;
00075             AVRational framerate;
00076 
00077             if (s1->video_size && (ret = av_parse_video_size(&width, &height, s1->video_size)) < 0) {
00078                 av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
00079                 goto fail;
00080             }
00081             if ((pix_fmt = av_get_pix_fmt(s1->pixel_format)) == PIX_FMT_NONE) {
00082                 av_log(s, AV_LOG_ERROR, "No such pixel format: %s.\n", s1->pixel_format);
00083                 ret = AVERROR(EINVAL);
00084                 goto fail;
00085             }
00086             if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
00087                 av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
00088                 goto fail;
00089             }
00090 #if FF_API_FORMAT_PARAMETERS
00091             if (ap->width > 0)
00092                 width = ap->width;
00093             if (ap->height > 0)
00094                 height = ap->height;
00095             if (ap->pix_fmt)
00096                 pix_fmt = ap->pix_fmt;
00097             if (ap->time_base.num)
00098                 framerate = (AVRational){ap->time_base.den, ap->time_base.num};
00099 #endif
00100             av_set_pts_info(st, 64, framerate.den, framerate.num);
00101             st->codec->width  = width;
00102             st->codec->height = height;
00103             st->codec->pix_fmt = pix_fmt;
00104 fail:
00105             return ret;
00106             }
00107         default:
00108             return -1;
00109         }
00110     return 0;
00111 }
00112 
00113 #define RAW_PACKET_SIZE 1024
00114 
00115 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
00116 {
00117     int ret, size;
00118 
00119     size = RAW_PACKET_SIZE;
00120 
00121     if (av_new_packet(pkt, size) < 0)
00122         return AVERROR(ENOMEM);
00123 
00124     pkt->pos= avio_tell(s->pb);
00125     pkt->stream_index = 0;
00126     ret = ffio_read_partial(s->pb, pkt->data, size);
00127     if (ret < 0) {
00128         av_free_packet(pkt);
00129         return ret;
00130     }
00131     pkt->size = ret;
00132     return ret;
00133 }
00134 
00135 int ff_raw_audio_read_header(AVFormatContext *s,
00136                              AVFormatParameters *ap)
00137 {
00138     AVStream *st = av_new_stream(s, 0);
00139     if (!st)
00140         return AVERROR(ENOMEM);
00141     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00142     st->codec->codec_id = s->iformat->value;
00143     st->need_parsing = AVSTREAM_PARSE_FULL;
00144     /* the parameters will be extracted from the compressed bitstream */
00145 
00146     return 0;
00147 }
00148 
00149 /* MPEG-1/H.263 input */
00150 int ff_raw_video_read_header(AVFormatContext *s,
00151                              AVFormatParameters *ap)
00152 {
00153     AVStream *st;
00154     FFRawVideoDemuxerContext *s1 = s->priv_data;
00155     AVRational framerate;
00156     int ret = 0;
00157 
00158 
00159     st = av_new_stream(s, 0);
00160     if (!st) {
00161         ret = AVERROR(ENOMEM);
00162         goto fail;
00163     }
00164 
00165     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00166     st->codec->codec_id = s->iformat->value;
00167     st->need_parsing = AVSTREAM_PARSE_FULL;
00168 
00169     if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
00170         av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
00171         goto fail;
00172     }
00173 #if FF_API_FORMAT_PARAMETERS
00174     if (ap->time_base.num)
00175         framerate = (AVRational){ap->time_base.den, ap->time_base.num};
00176 #endif
00177 
00178     st->codec->time_base = (AVRational){framerate.den, framerate.num};
00179     av_set_pts_info(st, 64, 1, 1200000);
00180 
00181 fail:
00182     return ret;
00183 }
00184 
00185 /* Note: Do not forget to add new entries to the Makefile as well. */
00186 
00187 static const AVOption audio_options[] = {
00188     { "sample_rate", "", offsetof(RawAudioDemuxerContext, sample_rate), FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
00189     { "channels",    "", offsetof(RawAudioDemuxerContext, channels),    FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
00190     { NULL },
00191 };
00192 
00193 const AVClass ff_rawaudio_demuxer_class = {
00194     .class_name     = "rawaudio demuxer",
00195     .item_name      = av_default_item_name,
00196     .option         = audio_options,
00197     .version        = LIBAVUTIL_VERSION_INT,
00198 };
00199 
00200 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
00201 #define DEC AV_OPT_FLAG_DECODING_PARAM
00202 static const AVOption video_options[] = {
00203     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), FF_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
00204     { "pixel_format", "", OFFSET(pixel_format), FF_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
00205     { "framerate", "", OFFSET(framerate), FF_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
00206     { NULL },
00207 };
00208 #undef OFFSET
00209 #undef DEC
00210 
00211 const AVClass ff_rawvideo_demuxer_class = {
00212     .class_name     = "rawvideo demuxer",
00213     .item_name      = av_default_item_name,
00214     .option         = video_options,
00215     .version        = LIBAVUTIL_VERSION_INT,
00216 };
00217 
00218 #if CONFIG_G722_DEMUXER
00219 AVInputFormat ff_g722_demuxer = {
00220     "g722",
00221     NULL_IF_CONFIG_SMALL("raw G.722"),
00222     sizeof(RawAudioDemuxerContext),
00223     NULL,
00224     ff_raw_read_header,
00225     ff_raw_read_partial_packet,
00226     .flags= AVFMT_GENERIC_INDEX,
00227     .extensions = "g722,722",
00228     .value = CODEC_ID_ADPCM_G722,
00229     .priv_class = &ff_rawaudio_demuxer_class,
00230 };
00231 #endif
00232 
00233 #if CONFIG_GSM_DEMUXER
00234 AVInputFormat ff_gsm_demuxer = {
00235     "gsm",
00236     NULL_IF_CONFIG_SMALL("raw GSM"),
00237     0,
00238     NULL,
00239     ff_raw_audio_read_header,
00240     ff_raw_read_partial_packet,
00241     .flags= AVFMT_GENERIC_INDEX,
00242     .extensions = "gsm",
00243     .value = CODEC_ID_GSM,
00244 };
00245 #endif
00246 
00247 #if CONFIG_MJPEG_DEMUXER
00248 FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg", CODEC_ID_MJPEG)
00249 #endif
00250 
00251 #if CONFIG_MLP_DEMUXER
00252 AVInputFormat ff_mlp_demuxer = {
00253     "mlp",
00254     NULL_IF_CONFIG_SMALL("raw MLP"),
00255     0,
00256     NULL,
00257     ff_raw_audio_read_header,
00258     ff_raw_read_partial_packet,
00259     .flags= AVFMT_GENERIC_INDEX,
00260     .extensions = "mlp",
00261     .value = CODEC_ID_MLP,
00262 };
00263 #endif
00264 
00265 #if CONFIG_TRUEHD_DEMUXER
00266 AVInputFormat ff_truehd_demuxer = {
00267     "truehd",
00268     NULL_IF_CONFIG_SMALL("raw TrueHD"),
00269     0,
00270     NULL,
00271     ff_raw_audio_read_header,
00272     ff_raw_read_partial_packet,
00273     .flags= AVFMT_GENERIC_INDEX,
00274     .extensions = "thd",
00275     .value = CODEC_ID_TRUEHD,
00276 };
00277 #endif
00278 
00279 #if CONFIG_SHORTEN_DEMUXER
00280 AVInputFormat ff_shorten_demuxer = {
00281     "shn",
00282     NULL_IF_CONFIG_SMALL("raw Shorten"),
00283     0,
00284     NULL,
00285     ff_raw_audio_read_header,
00286     ff_raw_read_partial_packet,
00287     .flags= AVFMT_GENERIC_INDEX,
00288     .extensions = "shn",
00289     .value = CODEC_ID_SHORTEN,
00290 };
00291 #endif
00292 
00293 #if CONFIG_VC1_DEMUXER
00294 FF_DEF_RAWVIDEO_DEMUXER(vc1, "raw VC-1", NULL, "vc1", CODEC_ID_VC1)
00295 #endif