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libvpxdec.c
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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 "libavutil/common.h"
31 #include "libavutil/imgutils.h"
32 #include "avcodec.h"
33 #include "internal.h"
34 #include "libvpx.h"
35 
36 typedef struct VP8DecoderContext {
37  struct vpx_codec_ctx decoder;
38 } VP8Context;
39 
40 static av_cold int vpx_init(AVCodecContext *avctx,
41  const struct vpx_codec_iface *iface)
42 {
43  VP8Context *ctx = avctx->priv_data;
44  struct vpx_codec_dec_cfg deccfg = {
45  /* token partitions+1 would be a decent choice */
46  .threads = FFMIN(avctx->thread_count, 16)
47  };
48 
49  av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
50  av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
51 
52  if (vpx_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != VPX_CODEC_OK) {
53  const char *error = vpx_codec_error(&ctx->decoder);
54  av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
55  error);
56  return AVERROR(EINVAL);
57  }
58 
59  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
60  return 0;
61 }
62 
63 static int vp8_decode(AVCodecContext *avctx,
64  void *data, int *got_frame, AVPacket *avpkt)
65 {
66  VP8Context *ctx = avctx->priv_data;
67  AVFrame *picture = data;
68  const void *iter = NULL;
69  struct vpx_image *img;
70  int ret;
71 
72  if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) !=
73  VPX_CODEC_OK) {
74  const char *error = vpx_codec_error(&ctx->decoder);
75  const char *detail = vpx_codec_error_detail(&ctx->decoder);
76 
77  av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error);
78  if (detail)
79  av_log(avctx, AV_LOG_ERROR, " Additional information: %s\n",
80  detail);
81  return AVERROR_INVALIDDATA;
82  }
83 
84  if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) {
85  if (img->fmt != VPX_IMG_FMT_I420) {
86  av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n",
87  img->fmt);
88  return AVERROR_INVALIDDATA;
89  }
90 
91  if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) {
92  av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n",
93  avctx->width, avctx->height, img->d_w, img->d_h);
94  ret = ff_set_dimensions(avctx, img->d_w, img->d_h);
95  if (ret < 0)
96  return ret;
97  }
98  if ((ret = ff_get_buffer(avctx, picture, 0)) < 0)
99  return ret;
100  av_image_copy(picture->data, picture->linesize, (const uint8_t **)img->planes,
101  img->stride, avctx->pix_fmt, img->d_w, img->d_h);
102  *got_frame = 1;
103  }
104  return avpkt->size;
105 }
106 
107 static 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 
114 #if CONFIG_LIBVPX_VP8_DECODER
115 static av_cold int vp8_init(AVCodecContext *avctx)
116 {
117  return vpx_init(avctx, &vpx_codec_vp8_dx_algo);
118 }
119 
120 AVCodec ff_libvpx_vp8_decoder = {
121  .name = "libvpx",
122  .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
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 | CODEC_CAP_DR1,
130 };
131 #endif /* CONFIG_LIBVPX_VP8_DECODER */
132 
133 #if CONFIG_LIBVPX_VP9_DECODER
134 static av_cold int vp9_init(AVCodecContext *avctx)
135 {
136  return vpx_init(avctx, &vpx_codec_vp9_dx_algo);
137 }
138 
139 AVCodec ff_libvpx_vp9_decoder = {
140  .name = "libvpx-vp9",
141  .long_name = NULL_IF_CONFIG_SMALL("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_DR1,
150 };
151 #endif /* CONFIG_LIBVPX_VP9_DECODER */