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/imgutils.h" 31#include "avcodec.h" 32 33typedef struct VP8DecoderContext { 34 struct vpx_codec_ctx decoder; 35} VP8Context; 36 37static av_cold int vp8_init(AVCodecContext *avctx) 38{ 39 VP8Context *ctx = avctx->priv_data; 40 const struct vpx_codec_iface *iface = &vpx_codec_vp8_dx_algo; 41 struct vpx_codec_dec_cfg deccfg = { 42 /* token partitions+1 would be a decent choice */ 43 .threads = FFMIN(avctx->thread_count, 16) 44 }; 45 46 av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str()); 47 av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config()); 48 49 if (vpx_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != VPX_CODEC_OK) { 50 const char *error = vpx_codec_error(&ctx->decoder); 51 av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n", 52 error); 53 return AVERROR(EINVAL); 54 } 55 56 avctx->pix_fmt = PIX_FMT_YUV420P; 57 return 0; 58} 59 60static int vp8_decode(AVCodecContext *avctx, 61 void *data, int *data_size, AVPacket *avpkt) 62{ 63 VP8Context *ctx = avctx->priv_data; 64 AVFrame *picture = data; 65 const void *iter = NULL; 66 struct vpx_image *img; 67 68 if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) != 69 VPX_CODEC_OK) { 70 const char *error = vpx_codec_error(&ctx->decoder); 71 const char *detail = vpx_codec_error_detail(&ctx->decoder); 72 73 av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error); 74 if (detail) 75 av_log(avctx, AV_LOG_ERROR, " Additional information: %s\n", 76 detail); 77 return AVERROR_INVALIDDATA; 78 } 79 80 if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) { 81 if (img->fmt != VPX_IMG_FMT_I420) { 82 av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n", 83 img->fmt); 84 return AVERROR_INVALIDDATA; 85 } 86 87 if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) { 88 av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n", 89 avctx->width, avctx->height, img->d_w, img->d_h); 90 if (av_image_check_size(img->d_w, img->d_h, 0, avctx)) 91 return AVERROR_INVALIDDATA; 92 avcodec_set_dimensions(avctx, img->d_w, img->d_h); 93 } 94 picture->data[0] = img->planes[0]; 95 picture->data[1] = img->planes[1]; 96 picture->data[2] = img->planes[2]; 97 picture->data[3] = NULL; 98 picture->linesize[0] = img->stride[0]; 99 picture->linesize[1] = img->stride[1]; 100 picture->linesize[2] = img->stride[2]; 101 picture->linesize[3] = 0; 102 *data_size = sizeof(AVPicture); 103 } 104 return avpkt->size; 105} 106 107static av_cold int vp8_free(AVCodecContext *avctx) 108{ 109 VP8Context *ctx = avctx->priv_data; 110 vpx_codec_destroy(&ctx->decoder); 111 return 0; 112} 113 114AVCodec ff_libvpx_decoder = { 115 .name = "libvpx", 116 .type = AVMEDIA_TYPE_VIDEO, 117 .id = CODEC_ID_VP8, 118 .priv_data_size = sizeof(VP8Context), 119 .init = vp8_init, 120 .close = vp8_free, 121 .decode = vp8_decode, 122 .capabilities = CODEC_CAP_AUTO_THREADS, 123 .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"), 124}; 125