• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavcodec/libvpxdec.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 2010, Google, Inc.
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00026 #define VPX_CODEC_DISABLE_COMPAT 1
00027 #include <vpx/vpx_decoder.h>
00028 #include <vpx/vp8dx.h>
00029 
00030 #include "avcodec.h"
00031 
00032 typedef struct VP8DecoderContext {
00033     struct vpx_codec_ctx decoder;
00034 } VP8Context;
00035 
00036 static av_cold int vp8_init(AVCodecContext *avctx)
00037 {
00038     VP8Context *ctx = avctx->priv_data;
00039     const struct vpx_codec_iface *iface = &vpx_codec_vp8_dx_algo;
00040     struct vpx_codec_dec_cfg deccfg = {
00041         /* token partitions+1 would be a decent choice */
00042         .threads = FFMIN(avctx->thread_count, 16)
00043     };
00044 
00045     av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
00046     av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
00047 
00048     if (vpx_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != VPX_CODEC_OK) {
00049         const char *error = vpx_codec_error(&ctx->decoder);
00050         av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
00051                error);
00052         return AVERROR(EINVAL);
00053     }
00054 
00055     avctx->pix_fmt = PIX_FMT_YUV420P;
00056     return 0;
00057 }
00058 
00059 static int vp8_decode(AVCodecContext *avctx,
00060                       void *data, int *data_size, AVPacket *avpkt)
00061 {
00062     VP8Context *ctx = avctx->priv_data;
00063     AVFrame *picture = data;
00064     const void *iter = NULL;
00065     struct vpx_image *img;
00066 
00067     if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) !=
00068         VPX_CODEC_OK) {
00069         const char *error  = vpx_codec_error(&ctx->decoder);
00070         const char *detail = vpx_codec_error_detail(&ctx->decoder);
00071 
00072         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error);
00073         if (detail)
00074             av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n",
00075                    detail);
00076         return AVERROR_INVALIDDATA;
00077     }
00078 
00079     if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) {
00080         if (img->fmt != VPX_IMG_FMT_I420) {
00081             av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n",
00082                    img->fmt);
00083             return AVERROR_INVALIDDATA;
00084         }
00085 
00086         if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) {
00087             av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n",
00088                    avctx->width, avctx->height, img->d_w, img->d_h);
00089             if (avcodec_check_dimensions(avctx, img->d_w, img->d_h))
00090                 return AVERROR_INVALIDDATA;
00091             avcodec_set_dimensions(avctx, img->d_w, img->d_h);
00092         }
00093         picture->data[0]     = img->planes[0];
00094         picture->data[1]     = img->planes[1];
00095         picture->data[2]     = img->planes[2];
00096         picture->data[3]     = NULL;
00097         picture->linesize[0] = img->stride[0];
00098         picture->linesize[1] = img->stride[1];
00099         picture->linesize[2] = img->stride[2];
00100         picture->linesize[3] = 0;
00101         *data_size           = sizeof(AVPicture);
00102     }
00103     return avpkt->size;
00104 }
00105 
00106 static av_cold int vp8_free(AVCodecContext *avctx)
00107 {
00108     VP8Context *ctx = avctx->priv_data;
00109     vpx_codec_destroy(&ctx->decoder);
00110     return 0;
00111 }
00112 
00113 AVCodec libvpx_decoder = {
00114     "libvpx",
00115     AVMEDIA_TYPE_VIDEO,
00116     CODEC_ID_VP8,
00117     sizeof(VP8Context),
00118     vp8_init,
00119     NULL, /* encode */
00120     vp8_free,
00121     vp8_decode,
00122     0, /* capabilities */
00123     .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
00124 };

Generated on Fri Sep 16 2011 17:17:38 for FFmpeg by  doxygen 1.7.1