libavcodec/libvpxdec.c

   1 /*
   2  * Copyright (c) 2010, Google, Inc.
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * VP8 decoder support via libvpx
  24  */
  25
  26 #define VPX_CODEC_DISABLE_COMPAT 1
  27 #include <vpx/vpx_decoder.h>
  28 #include <vpx/vp8dx.h>
  29
  30 #include "libavutil/common.h"
  31 #include "libavutil/imgutils.h"
  32 #include "avcodec.h"
  33
  34 typedef struct VP8DecoderContext {
  35     struct vpx_codec_ctx decoder;
  36 } VP8Context;
  37
  38 static av_cold int vpx_init(AVCodecContext *avctx,
  39                             const struct vpx_codec_iface *iface)
  40 {
  41     VP8Context *ctx = avctx->priv_data;
  42     struct vpx_codec_dec_cfg deccfg = {
  43         /* token partitions+1 would be a decent choice */
  44         .threads = FFMIN(avctx->thread_count, 16)
  45     };
  46
  47     av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
  48     av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
  49
  50     if (vpx_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != VPX_CODEC_OK) {
  51         const char *error = vpx_codec_error(&ctx->decoder);
  52         av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
  53                error);
  54         return AVERROR(EINVAL);
  55     }
  56
  57     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  58     return 0;
  59 }
  60
  61 static int vp8_decode(AVCodecContext *avctx,
  62                       void *data, int *got_frame, AVPacket *avpkt)
  63 {
  64     VP8Context *ctx = avctx->priv_data;
  65     AVFrame *picture = data;
  66     const void *iter = NULL;
  67     struct vpx_image *img;
  68
  69     if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) !=
  70         VPX_CODEC_OK) {
  71         const char *error  = vpx_codec_error(&ctx->decoder);
  72         const char *detail = vpx_codec_error_detail(&ctx->decoder);
  73
  74         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error);
  75         if (detail)
  76             av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n",
  77                    detail);
  78         return AVERROR_INVALIDDATA;
  79     }
  80
  81     if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) {
  82         if (img->fmt != VPX_IMG_FMT_I420) {
  83             av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n",
  84                    img->fmt);
  85             return AVERROR_INVALIDDATA;
  86         }
  87
  88         if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) {
  89             av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n",
  90                    avctx->width, avctx->height, img->d_w, img->d_h);
  91             if (av_image_check_size(img->d_w, img->d_h, 0, avctx))
  92                 return AVERROR_INVALIDDATA;
  93             avcodec_set_dimensions(avctx, img->d_w, img->d_h);
  94         }
  95         picture->data[0]     = img->planes[0];
  96         picture->data[1]     = img->planes[1];
  97         picture->data[2]     = img->planes[2];
  98         picture->data[3]     = NULL;
  99         picture->linesize[0] = img->stride[0];
 100         picture->linesize[1] = img->stride[1];
 101         picture->linesize[2] = img->stride[2];
 102         picture->linesize[3] = 0;
 103         *got_frame           = 1;
 104     }
 105     return avpkt->size;
 106 }
 107
 108 static av_cold int vp8_free(AVCodecContext *avctx)
 109 {
 110     VP8Context *ctx = avctx->priv_data;
 111     vpx_codec_destroy(&ctx->decoder);
 112     return 0;
 113 }
 114
 115 #if CONFIG_LIBVPX_VP8_DECODER
 116 static av_cold int vp8_init(AVCodecContext *avctx)
 117 {
 118     return vpx_init(avctx, &vpx_codec_vp8_dx_algo);
 119 }
 120
 121 AVCodec ff_libvpx_vp8_decoder = {
 122     .name           = "libvpx",
 123     .type           = AVMEDIA_TYPE_VIDEO,
 124     .id             = AV_CODEC_ID_VP8,
 125     .priv_data_size = sizeof(VP8Context),
 126     .init           = vp8_init,
 127     .close          = vp8_free,
 128     .decode         = vp8_decode,
 129     .capabilities   = CODEC_CAP_AUTO_THREADS,
 130     .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP8"),
 131 };
 132 #endif /* CONFIG_LIBVPX_VP8_DECODER */
 133
 134 #if CONFIG_LIBVPX_VP9_DECODER
 135 static av_cold int vp9_init(AVCodecContext *avctx)
 136 {
 137     return vpx_init(avctx, &vpx_codec_vp9_dx_algo);
 138 }
 139
 140 AVCodec ff_libvpx_vp9_decoder = {
 141     .name           = "libvpx-vp9",
 142     .type           = AVMEDIA_TYPE_VIDEO,
 143     .id             = AV_CODEC_ID_VP9,
 144     .priv_data_size = sizeof(VP8Context),
 145     .init           = vp9_init,
 146     .close          = vp8_free,
 147     .decode         = vp8_decode,
 148     .capabilities   = CODEC_CAP_AUTO_THREADS | CODEC_CAP_EXPERIMENTAL,
 149     .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP9"),
 150 };
 151 #endif /* CONFIG_LIBVPX_VP9_DECODER */