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