set constant QP from AVCodecContext.global_quality.
[libav.git] / libavcodec / x264.c
1 /*
2 * H.264 encoding using the x264 library
3 * Copyright (C) 2005 Måns Rullgård <mru@inprovide.com>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include "avcodec.h"
21 #include <x264.h>
22
23 typedef struct X264Context {
24 x264_param_t params;
25 x264_t *enc;
26 x264_picture_t pic;
27 AVFrame out_pic;
28 } X264Context;
29
30 static void
31 X264_log(void *p, int level, const char *fmt, va_list args)
32 {
33 static const int level_map[] = {
34 [X264_LOG_ERROR] = AV_LOG_ERROR,
35 [X264_LOG_WARNING] = AV_LOG_ERROR,
36 [X264_LOG_INFO] = AV_LOG_INFO,
37 [X264_LOG_DEBUG] = AV_LOG_DEBUG
38 };
39
40 if(level < 0 || level > X264_LOG_DEBUG)
41 return;
42
43 av_vlog(p, level_map[level], fmt, args);
44 }
45
46
47 static int
48 encode_nals(u_char *buf, int size, x264_nal_t *nals, int nnal)
49 {
50 u_char *p = buf;
51 int i;
52
53 for(i = 0; i < nnal; i++){
54 int s = x264_nal_encode(p, &size, 1, nals + i);
55 if(s < 0)
56 return -1;
57 p += s;
58 }
59
60 return p - buf;
61 }
62
63 extern int
64 X264_frame(AVCodecContext *ctx, uint8_t *buf, int bufsize, void *data)
65 {
66 X264Context *x4 = ctx->priv_data;
67 AVFrame *frame = data;
68 x264_nal_t *nal;
69 int nnal, i;
70 x264_picture_t pic_out;
71
72 x4->pic.img.i_csp = X264_CSP_I420;
73 x4->pic.img.i_plane = 3;
74
75 for(i = 0; i < 3; i++){
76 x4->pic.img.plane[i] = frame->data[i];
77 x4->pic.img.i_stride[i] = frame->linesize[i];
78 }
79
80 x4->pic.i_pts = frame->pts;
81 x4->pic.i_type = X264_TYPE_AUTO;
82
83 if(x264_encoder_encode(x4->enc, &nal, &nnal, &x4->pic, &pic_out))
84 return -1;
85
86 bufsize = encode_nals(buf, bufsize, nal, nnal);
87 if(bufsize < 0)
88 return -1;
89
90 /* FIXME: dts */
91 x4->out_pic.pts = pic_out.i_pts;
92
93 switch(pic_out.i_type){
94 case X264_TYPE_IDR:
95 case X264_TYPE_I:
96 x4->out_pic.pict_type = FF_I_TYPE;
97 break;
98 case X264_TYPE_P:
99 x4->out_pic.pict_type = FF_P_TYPE;
100 break;
101 case X264_TYPE_B:
102 case X264_TYPE_BREF:
103 x4->out_pic.pict_type = FF_B_TYPE;
104 break;
105 }
106
107 x4->out_pic.key_frame = pic_out.i_type == X264_TYPE_IDR;
108 x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
109
110 return bufsize;
111 }
112
113 static int
114 X264_close(AVCodecContext *avctx)
115 {
116 X264Context *x4 = avctx->priv_data;
117
118 if(x4->enc)
119 x264_encoder_close(x4->enc);
120
121 return 0;
122 }
123
124 extern int
125 X264_init(AVCodecContext *avctx)
126 {
127 X264Context *x4 = avctx->priv_data;
128
129 x264_param_default(&x4->params);
130
131 x4->params.pf_log = X264_log;
132 x4->params.p_log_private = avctx;
133
134 x4->params.i_keyint_max = avctx->gop_size;
135 x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
136 x4->params.rc.i_rc_buffer_size = avctx->rc_buffer_size / 1000;
137 if(avctx->rc_buffer_size)
138 x4->params.rc.b_cbr = 1;
139 x4->params.rc.i_qp_min = avctx->qmin;
140 x4->params.rc.i_qp_max = avctx->qmax;
141 x4->params.rc.i_qp_step = avctx->max_qdiff;
142
143 if(avctx->flags & CODEC_FLAG_QSCALE && avctx->global_quality > 0)
144 x4->params.rc.i_qp_constant =
145 12 + 6 * log2((double) avctx->global_quality / FF_QP2LAMBDA);
146
147 x4->params.i_width = avctx->width;
148 x4->params.i_height = avctx->height;
149 x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
150 x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
151 x4->params.i_fps_num = avctx->frame_rate;
152 x4->params.i_fps_den = avctx->frame_rate_base;
153
154 x4->enc = x264_encoder_open(&x4->params);
155 if(!x4->enc)
156 return -1;
157
158 avctx->coded_frame = &x4->out_pic;
159
160 return 0;
161 }
162
163 AVCodec x264_encoder = {
164 .name = "h264",
165 .type = CODEC_TYPE_VIDEO,
166 .id = CODEC_ID_H264,
167 .priv_data_size = sizeof(X264Context),
168 .init = X264_init,
169 .encode = X264_frame,
170 .close = X264_close,
171 .pix_fmts = (enum PixelFormat[]) { PIX_FMT_YUV420P, -1 }
172 };