1/*
2 * Copyright (c) 2010, Google, Inc.
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "avcodec.h"
31
32typedef struct VP8DecoderContext {
33    struct vpx_codec_ctx decoder;
34} VP8Context;
35
36static av_cold int vp8_init(AVCodecContext *avctx)
37{
38    VP8Context *ctx = avctx->priv_data;
39    const struct vpx_codec_iface *iface = &vpx_codec_vp8_dx_algo;
40    struct vpx_codec_dec_cfg deccfg = {
41        /* token partitions+1 would be a decent choice */
42        .threads = FFMIN(avctx->thread_count, 16)
43    };
44
45    av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
46    av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
47
48    if (vpx_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != VPX_CODEC_OK) {
49        const char *error = vpx_codec_error(&ctx->decoder);
50        av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
51               error);
52        return AVERROR(EINVAL);
53    }
54
55    avctx->pix_fmt = PIX_FMT_YUV420P;
56    return 0;
57}
58
59static int vp8_decode(AVCodecContext *avctx,
60                      void *data, int *data_size, AVPacket *avpkt)
61{
62    VP8Context *ctx = avctx->priv_data;
63    AVFrame *picture = data;
64    const void *iter = NULL;
65    struct vpx_image *img;
66
67    if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) !=
68        VPX_CODEC_OK) {
69        const char *error  = vpx_codec_error(&ctx->decoder);
70        const char *detail = vpx_codec_error_detail(&ctx->decoder);
71
72        av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error);
73        if (detail)
74            av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n",
75                   detail);
76        return AVERROR_INVALIDDATA;
77    }
78
79    if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) {
80        if (img->fmt != VPX_IMG_FMT_I420) {
81            av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n",
82                   img->fmt);
83            return AVERROR_INVALIDDATA;
84        }
85
86        if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) {
87            av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n",
88                   avctx->width, avctx->height, img->d_w, img->d_h);
89            if (avcodec_check_dimensions(avctx, img->d_w, img->d_h))
90                return AVERROR_INVALIDDATA;
91            avcodec_set_dimensions(avctx, img->d_w, img->d_h);
92        }
93        picture->data[0]     = img->planes[0];
94        picture->data[1]     = img->planes[1];
95        picture->data[2]     = img->planes[2];
96        picture->data[3]     = NULL;
97        picture->linesize[0] = img->stride[0];
98        picture->linesize[1] = img->stride[1];
99        picture->linesize[2] = img->stride[2];
100        picture->linesize[3] = 0;
101        *data_size           = sizeof(AVPicture);
102    }
103    return avpkt->size;
104}
105
106static av_cold int vp8_free(AVCodecContext *avctx)
107{
108    VP8Context *ctx = avctx->priv_data;
109    vpx_codec_destroy(&ctx->decoder);
110    return 0;
111}
112
113AVCodec libvpx_decoder = {
114    "libvpx",
115    AVMEDIA_TYPE_VIDEO,
116    CODEC_ID_VP8,
117    sizeof(VP8Context),
118    vp8_init,
119    NULL, /* encode */
120    vp8_free,
121    vp8_decode,
122    0, /* capabilities */
123    .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
124};
125