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ffmpeg / libavcodec / libvpxdec.c @ 2912e87a

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/*
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 * Copyright (c) 2010, Google, Inc.
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * VP8 decoder support via libvpx
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 */
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#define VPX_CODEC_DISABLE_COMPAT 1
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#include <vpx/vpx_decoder.h>
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#include <vpx/vp8dx.h>
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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typedef struct VP8DecoderContext {
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    struct vpx_codec_ctx decoder;
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} VP8Context;
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static av_cold int vp8_init(AVCodecContext *avctx)
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{
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    VP8Context *ctx = avctx->priv_data;
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    const struct vpx_codec_iface *iface = &vpx_codec_vp8_dx_algo;
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    struct vpx_codec_dec_cfg deccfg = {
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        /* token partitions+1 would be a decent choice */
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        .threads = FFMIN(avctx->thread_count, 16)
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    };
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    av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
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    av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
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    if (vpx_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != VPX_CODEC_OK) {
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        const char *error = vpx_codec_error(&ctx->decoder);
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        av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
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               error);
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        return AVERROR(EINVAL);
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    }
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    avctx->pix_fmt = PIX_FMT_YUV420P;
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    return 0;
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}
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static int vp8_decode(AVCodecContext *avctx,
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                      void *data, int *data_size, AVPacket *avpkt)
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{
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    VP8Context *ctx = avctx->priv_data;
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    AVFrame *picture = data;
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    const void *iter = NULL;
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    struct vpx_image *img;
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    if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) !=
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        VPX_CODEC_OK) {
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        const char *error  = vpx_codec_error(&ctx->decoder);
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        const char *detail = vpx_codec_error_detail(&ctx->decoder);
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        av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error);
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        if (detail)
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            av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n",
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                   detail);
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        return AVERROR_INVALIDDATA;
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    }
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    if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) {
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        if (img->fmt != VPX_IMG_FMT_I420) {
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            av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n",
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                   img->fmt);
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            return AVERROR_INVALIDDATA;
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        }
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        if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) {
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            av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n",
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                   avctx->width, avctx->height, img->d_w, img->d_h);
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            if (av_image_check_size(img->d_w, img->d_h, 0, avctx))
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                return AVERROR_INVALIDDATA;
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            avcodec_set_dimensions(avctx, img->d_w, img->d_h);
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        }
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        picture->data[0]     = img->planes[0];
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        picture->data[1]     = img->planes[1];
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        picture->data[2]     = img->planes[2];
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        picture->data[3]     = NULL;
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        picture->linesize[0] = img->stride[0];
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        picture->linesize[1] = img->stride[1];
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        picture->linesize[2] = img->stride[2];
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        picture->linesize[3] = 0;
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        *data_size           = sizeof(AVPicture);
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    }
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    return avpkt->size;
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}
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static av_cold int vp8_free(AVCodecContext *avctx)
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{
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    VP8Context *ctx = avctx->priv_data;
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    vpx_codec_destroy(&ctx->decoder);
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    return 0;
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}
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AVCodec ff_libvpx_decoder = {
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    "libvpx",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_VP8,
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    sizeof(VP8Context),
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    vp8_init,
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    NULL, /* encode */
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    vp8_free,
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    vp8_decode,
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    0, /* capabilities */
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    .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
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};