1/*
2 * H.264 encoding using the x264 library
3 * Copyright (C) 2005  Mans Rullgard <mans@mansr.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avcodec.h"
23#include <x264.h>
24#include <math.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28
29typedef struct X264Context {
30    x264_param_t    params;
31    x264_t         *enc;
32    x264_picture_t  pic;
33    uint8_t        *sei;
34    int             sei_size;
35    AVFrame         out_pic;
36} X264Context;
37
38static void X264_log(void *p, int level, const char *fmt, va_list args)
39{
40    static const int level_map[] = {
41        [X264_LOG_ERROR]   = AV_LOG_ERROR,
42        [X264_LOG_WARNING] = AV_LOG_WARNING,
43        [X264_LOG_INFO]    = AV_LOG_INFO,
44        [X264_LOG_DEBUG]   = AV_LOG_DEBUG
45    };
46
47    if (level < 0 || level > X264_LOG_DEBUG)
48        return;
49
50    av_vlog(p, level_map[level], fmt, args);
51}
52
53
54static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size,
55                       x264_nal_t *nals, int nnal, int skip_sei)
56{
57    X264Context *x4 = ctx->priv_data;
58    uint8_t *p = buf;
59    int i;
60
61    /* Write the SEI as part of the first frame. */
62    if (x4->sei_size > 0 && nnal > 0) {
63        memcpy(p, x4->sei, x4->sei_size);
64        p += x4->sei_size;
65        x4->sei_size = 0;
66    }
67
68    for (i = 0; i < nnal; i++){
69        /* Don't put the SEI in extradata. */
70        if (skip_sei && nals[i].i_type == NAL_SEI) {
71            x4->sei_size = nals[i].i_payload;
72            x4->sei      = av_malloc(x4->sei_size);
73            memcpy(x4->sei, nals[i].p_payload, nals[i].i_payload);
74            continue;
75        }
76        memcpy(p, nals[i].p_payload, nals[i].i_payload);
77        p += nals[i].i_payload;
78    }
79
80    return p - buf;
81}
82
83static int X264_frame(AVCodecContext *ctx, uint8_t *buf,
84                      int bufsize, void *data)
85{
86    X264Context *x4 = ctx->priv_data;
87    AVFrame *frame = data;
88    x264_nal_t *nal;
89    int nnal, i;
90    x264_picture_t pic_out;
91
92    x4->pic.img.i_csp   = X264_CSP_I420;
93    x4->pic.img.i_plane = 3;
94
95    if (frame) {
96        for (i = 0; i < 3; i++) {
97            x4->pic.img.plane[i]    = frame->data[i];
98            x4->pic.img.i_stride[i] = frame->linesize[i];
99        }
100
101        x4->pic.i_pts  = frame->pts;
102        x4->pic.i_type = X264_TYPE_AUTO;
103    }
104
105    if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)
106        return -1;
107
108    bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
109    if (bufsize < 0)
110        return -1;
111
112    /* FIXME: libx264 now provides DTS, but AVFrame doesn't have a field for it. */
113    x4->out_pic.pts = pic_out.i_pts;
114
115    switch (pic_out.i_type) {
116    case X264_TYPE_IDR:
117    case X264_TYPE_I:
118        x4->out_pic.pict_type = FF_I_TYPE;
119        break;
120    case X264_TYPE_P:
121        x4->out_pic.pict_type = FF_P_TYPE;
122        break;
123    case X264_TYPE_B:
124    case X264_TYPE_BREF:
125        x4->out_pic.pict_type = FF_B_TYPE;
126        break;
127    }
128
129    x4->out_pic.key_frame = pic_out.b_keyframe;
130    x4->out_pic.quality   = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
131
132    return bufsize;
133}
134
135static av_cold int X264_close(AVCodecContext *avctx)
136{
137    X264Context *x4 = avctx->priv_data;
138
139    av_freep(&avctx->extradata);
140    av_free(x4->sei);
141
142    if (x4->enc)
143        x264_encoder_close(x4->enc);
144
145    return 0;
146}
147
148static av_cold int X264_init(AVCodecContext *avctx)
149{
150    X264Context *x4 = avctx->priv_data;
151
152    x4->sei_size = 0;
153    x264_param_default(&x4->params);
154
155    x4->params.pf_log               = X264_log;
156    x4->params.p_log_private        = avctx;
157
158    x4->params.i_keyint_max         = avctx->gop_size;
159    x4->params.rc.i_bitrate         = avctx->bit_rate       / 1000;
160    x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
161    x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;
162    x4->params.rc.b_stat_write      = avctx->flags & CODEC_FLAG_PASS1;
163    if (avctx->flags & CODEC_FLAG_PASS2) {
164        x4->params.rc.b_stat_read = 1;
165    } else {
166        if (avctx->crf) {
167            x4->params.rc.i_rc_method   = X264_RC_CRF;
168            x4->params.rc.f_rf_constant = avctx->crf;
169        } else if (avctx->cqp > -1) {
170            x4->params.rc.i_rc_method   = X264_RC_CQP;
171            x4->params.rc.i_qp_constant = avctx->cqp;
172        }
173    }
174
175    // if neither crf nor cqp modes are selected we have to enable the RC
176    // we do it this way because we cannot check if the bitrate has been set
177    if (!(avctx->crf || (avctx->cqp > -1)))
178        x4->params.rc.i_rc_method = X264_RC_ABR;
179
180    x4->params.i_bframe          = avctx->max_b_frames;
181    x4->params.b_cabac           = avctx->coder_type == FF_CODER_TYPE_AC;
182    x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
183    x4->params.i_bframe_bias     = avctx->bframebias;
184    x4->params.i_bframe_pyramid  = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? X264_B_PYRAMID_NORMAL : X264_B_PYRAMID_NONE;
185    avctx->has_b_frames          = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames;
186
187    x4->params.i_keyint_min = avctx->keyint_min;
188    if (x4->params.i_keyint_min > x4->params.i_keyint_max)
189        x4->params.i_keyint_min = x4->params.i_keyint_max;
190
191    x4->params.i_scenecut_threshold        = avctx->scenechange_threshold;
192
193    x4->params.b_deblocking_filter         = avctx->flags & CODEC_FLAG_LOOP_FILTER;
194    x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
195    x4->params.i_deblocking_filter_beta    = avctx->deblockbeta;
196
197    x4->params.rc.i_qp_min                 = avctx->qmin;
198    x4->params.rc.i_qp_max                 = avctx->qmax;
199    x4->params.rc.i_qp_step                = avctx->max_qdiff;
200
201    x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
202    x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */
203    x4->params.rc.f_complexity_blur = avctx->complexityblur;
204
205    x4->params.i_frame_reference    = avctx->refs;
206
207    x4->params.i_width              = avctx->width;
208    x4->params.i_height             = avctx->height;
209    x4->params.vui.i_sar_width      = avctx->sample_aspect_ratio.num;
210    x4->params.vui.i_sar_height     = avctx->sample_aspect_ratio.den;
211    x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den;
212    x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num;
213
214    x4->params.analyse.inter    = 0;
215    if (avctx->partitions) {
216        if (avctx->partitions & X264_PART_I4X4)
217            x4->params.analyse.inter |= X264_ANALYSE_I4x4;
218        if (avctx->partitions & X264_PART_I8X8)
219            x4->params.analyse.inter |= X264_ANALYSE_I8x8;
220        if (avctx->partitions & X264_PART_P8X8)
221            x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;
222        if (avctx->partitions & X264_PART_P4X4)
223            x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;
224        if (avctx->partitions & X264_PART_B8X8)
225            x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;
226    }
227
228    x4->params.analyse.i_direct_mv_pred  = avctx->directpred;
229
230    x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
231    x4->params.analyse.i_weighted_pred = avctx->weighted_p_pred;
232
233    if (avctx->me_method == ME_EPZS)
234        x4->params.analyse.i_me_method = X264_ME_DIA;
235    else if (avctx->me_method == ME_HEX)
236        x4->params.analyse.i_me_method = X264_ME_HEX;
237    else if (avctx->me_method == ME_UMH)
238        x4->params.analyse.i_me_method = X264_ME_UMH;
239    else if (avctx->me_method == ME_FULL)
240        x4->params.analyse.i_me_method = X264_ME_ESA;
241    else if (avctx->me_method == ME_TESA)
242        x4->params.analyse.i_me_method = X264_ME_TESA;
243    else x4->params.analyse.i_me_method = X264_ME_HEX;
244
245    x4->params.rc.i_aq_mode               = avctx->aq_mode;
246    x4->params.rc.f_aq_strength           = avctx->aq_strength;
247    x4->params.rc.i_lookahead             = avctx->rc_lookahead;
248
249    x4->params.analyse.b_psy              = avctx->flags2 & CODEC_FLAG2_PSY;
250    x4->params.analyse.f_psy_rd           = avctx->psy_rd;
251    x4->params.analyse.f_psy_trellis      = avctx->psy_trellis;
252
253    x4->params.analyse.i_me_range         = avctx->me_range;
254    x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;
255
256    x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
257    x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;
258    x4->params.analyse.b_transform_8x8    = avctx->flags2 & CODEC_FLAG2_8X8DCT;
259    x4->params.analyse.b_fast_pskip       = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
260
261    x4->params.analyse.i_trellis          = avctx->trellis;
262    x4->params.analyse.i_noise_reduction  = avctx->noise_reduction;
263
264    if (avctx->level > 0)
265        x4->params.i_level_idc = avctx->level;
266
267    x4->params.rc.f_rate_tolerance =
268        (float)avctx->bit_rate_tolerance/avctx->bit_rate;
269
270    if ((avctx->rc_buffer_size != 0) &&
271        (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
272        x4->params.rc.f_vbv_buffer_init =
273            (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
274    } else
275        x4->params.rc.f_vbv_buffer_init = 0.9;
276
277    x4->params.rc.b_mb_tree               = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);
278    x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);
279    x4->params.rc.f_pb_factor             = avctx->b_quant_factor;
280    x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
281
282    x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
283    x4->params.analyse.b_ssim = avctx->flags2 & CODEC_FLAG2_SSIM;
284    x4->params.i_log_level    = X264_LOG_DEBUG;
285
286    x4->params.b_aud          = avctx->flags2 & CODEC_FLAG2_AUD;
287
288    x4->params.i_threads      = avctx->thread_count;
289
290    x4->params.b_interlaced   = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
291
292    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
293        x4->params.b_repeat_headers = 0;
294
295    x4->enc = x264_encoder_open(&x4->params);
296    if (!x4->enc)
297        return -1;
298
299    avctx->coded_frame = &x4->out_pic;
300
301    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
302        x264_nal_t *nal;
303        int nnal, s, i;
304
305        s = x264_encoder_headers(x4->enc, &nal, &nnal);
306
307        for (i = 0; i < nnal; i++)
308            if (nal[i].i_type == NAL_SEI)
309                av_log(avctx, AV_LOG_INFO, "%s\n", nal[i].p_payload+25);
310
311        avctx->extradata      = av_malloc(s);
312        avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
313    }
314
315    return 0;
316}
317
318AVCodec libx264_encoder = {
319    .name           = "libx264",
320    .type           = AVMEDIA_TYPE_VIDEO,
321    .id             = CODEC_ID_H264,
322    .priv_data_size = sizeof(X264Context),
323    .init           = X264_init,
324    .encode         = X264_frame,
325    .close          = X264_close,
326    .capabilities   = CODEC_CAP_DELAY,
327    .pix_fmts       = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
328    .long_name      = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
329};
330