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#if X264_BUILD >= 76
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#else
83static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size, x264_nal_t *nals, int nnal, int skip_sei)
84{
85    X264Context *x4 = ctx->priv_data;
86    uint8_t *p = buf;
87    int i, s;
88
89    /* Write the SEI as part of the first frame. */
90    if (x4->sei_size > 0 && nnal > 0) {
91        memcpy(p, x4->sei, x4->sei_size);
92        p += x4->sei_size;
93        x4->sei_size = 0;
94    }
95
96    for (i = 0; i < nnal; i++) {
97        /* Don't put the SEI in extradata. */
98        if (skip_sei && nals[i].i_type == NAL_SEI) {
99            x4->sei = av_malloc( 5 + nals[i].i_payload * 4 / 3 );
100            if(x264_nal_encode(x4->sei, &x4->sei_size, 1, nals + i) < 0)
101                return -1;
102            continue;
103        }
104        s = x264_nal_encode(p, &size, 1, nals + i);
105        if (s < 0)
106            return -1;
107        p += s;
108    }
109
110    return p - buf;
111}
112#endif
113
114static int X264_frame(AVCodecContext *ctx, uint8_t *buf,
115                      int bufsize, void *data)
116{
117    X264Context *x4 = ctx->priv_data;
118    AVFrame *frame = data;
119    x264_nal_t *nal;
120    int nnal, i;
121    x264_picture_t pic_out;
122
123    x4->pic.img.i_csp   = X264_CSP_I420;
124    x4->pic.img.i_plane = 3;
125
126    if (frame) {
127        for (i = 0; i < 3; i++) {
128            x4->pic.img.plane[i] = frame->data[i];
129            x4->pic.img.i_stride[i] = frame->linesize[i];
130        }
131
132        x4->pic.i_pts  = frame->pts;
133        x4->pic.i_type = X264_TYPE_AUTO;
134    }
135
136    if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)
137        return -1;
138
139    bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
140    if (bufsize < 0)
141        return -1;
142
143    /* FIXME: libx264 now provides DTS, but AVFrame doesn't have a field for it. */
144    x4->out_pic.pts = pic_out.i_pts;
145
146    switch (pic_out.i_type) {
147    case X264_TYPE_IDR:
148    case X264_TYPE_I:
149        x4->out_pic.pict_type = FF_I_TYPE;
150        break;
151    case X264_TYPE_P:
152        x4->out_pic.pict_type = FF_P_TYPE;
153        break;
154    case X264_TYPE_B:
155    case X264_TYPE_BREF:
156        x4->out_pic.pict_type = FF_B_TYPE;
157        break;
158    }
159
160#if X264_BUILD < 82
161    x4->out_pic.key_frame = pic_out.i_type == X264_TYPE_IDR;
162#else
163    x4->out_pic.key_frame = pic_out.b_keyframe;
164#endif
165    x4->out_pic.quality   = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
166
167    return bufsize;
168}
169
170static av_cold int X264_close(AVCodecContext *avctx)
171{
172    X264Context *x4 = avctx->priv_data;
173
174    av_freep(&avctx->extradata);
175    av_free(x4->sei);
176
177    if (x4->enc)
178        x264_encoder_close(x4->enc);
179
180    return 0;
181}
182
183static av_cold int X264_init(AVCodecContext *avctx)
184{
185    X264Context *x4 = avctx->priv_data;
186
187    x4->sei_size = 0;
188    x264_param_default(&x4->params);
189
190    x4->params.pf_log               = X264_log;
191    x4->params.p_log_private        = avctx;
192
193    x4->params.i_keyint_max         = avctx->gop_size;
194    x4->params.rc.i_bitrate         = avctx->bit_rate       / 1000;
195    x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
196    x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;
197    x4->params.rc.b_stat_write      = avctx->flags & CODEC_FLAG_PASS1;
198    if (avctx->flags & CODEC_FLAG_PASS2) {
199        x4->params.rc.b_stat_read = 1;
200    } else {
201        if (avctx->crf) {
202            x4->params.rc.i_rc_method   = X264_RC_CRF;
203            x4->params.rc.f_rf_constant = avctx->crf;
204        } else if (avctx->cqp > -1) {
205            x4->params.rc.i_rc_method   = X264_RC_CQP;
206            x4->params.rc.i_qp_constant = avctx->cqp;
207        }
208    }
209
210    // if neither crf nor cqp modes are selected we have to enable the RC
211    // we do it this way because we cannot check if the bitrate has been set
212    if (!(avctx->crf || (avctx->cqp > -1)))
213        x4->params.rc.i_rc_method = X264_RC_ABR;
214
215    x4->params.i_bframe          = avctx->max_b_frames;
216    x4->params.b_cabac           = avctx->coder_type == FF_CODER_TYPE_AC;
217    x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
218    x4->params.i_bframe_bias     = avctx->bframebias;
219#if X264_BUILD >= 78
220    x4->params.i_bframe_pyramid  = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? X264_B_PYRAMID_NORMAL : X264_B_PYRAMID_NONE;
221#else
222    x4->params.b_bframe_pyramid  = avctx->flags2 & CODEC_FLAG2_BPYRAMID;
223#endif
224    avctx->has_b_frames          = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames;
225
226    x4->params.i_keyint_min = avctx->keyint_min;
227    if (x4->params.i_keyint_min > x4->params.i_keyint_max)
228        x4->params.i_keyint_min = x4->params.i_keyint_max;
229
230    x4->params.i_scenecut_threshold        = avctx->scenechange_threshold;
231
232    x4->params.b_deblocking_filter         = avctx->flags & CODEC_FLAG_LOOP_FILTER;
233    x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
234    x4->params.i_deblocking_filter_beta    = avctx->deblockbeta;
235
236    x4->params.rc.i_qp_min                 = avctx->qmin;
237    x4->params.rc.i_qp_max                 = avctx->qmax;
238    x4->params.rc.i_qp_step                = avctx->max_qdiff;
239
240    x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
241    x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */
242    x4->params.rc.f_complexity_blur = avctx->complexityblur;
243
244    x4->params.i_frame_reference    = avctx->refs;
245
246    x4->params.i_width              = avctx->width;
247    x4->params.i_height             = avctx->height;
248    x4->params.vui.i_sar_width      = avctx->sample_aspect_ratio.num;
249    x4->params.vui.i_sar_height     = avctx->sample_aspect_ratio.den;
250#if X264_BUILD >= 81
251    x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den;
252    x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num;
253#endif
254
255    x4->params.analyse.inter    = 0;
256    if (avctx->partitions) {
257        if (avctx->partitions & X264_PART_I4X4)
258            x4->params.analyse.inter |= X264_ANALYSE_I4x4;
259        if (avctx->partitions & X264_PART_I8X8)
260            x4->params.analyse.inter |= X264_ANALYSE_I8x8;
261        if (avctx->partitions & X264_PART_P8X8)
262            x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;
263        if (avctx->partitions & X264_PART_P4X4)
264            x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;
265        if (avctx->partitions & X264_PART_B8X8)
266            x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;
267    }
268
269    x4->params.analyse.i_direct_mv_pred  = avctx->directpred;
270
271    x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
272#if X264_BUILD >= 79
273    x4->params.analyse.i_weighted_pred = avctx->weighted_p_pred;
274#endif
275
276    if (avctx->me_method == ME_EPZS)
277        x4->params.analyse.i_me_method = X264_ME_DIA;
278    else if (avctx->me_method == ME_HEX)
279        x4->params.analyse.i_me_method = X264_ME_HEX;
280    else if (avctx->me_method == ME_UMH)
281        x4->params.analyse.i_me_method = X264_ME_UMH;
282    else if (avctx->me_method == ME_FULL)
283        x4->params.analyse.i_me_method = X264_ME_ESA;
284    else if (avctx->me_method == ME_TESA)
285        x4->params.analyse.i_me_method = X264_ME_TESA;
286    else x4->params.analyse.i_me_method = X264_ME_HEX;
287
288    x4->params.analyse.i_me_range         = avctx->me_range;
289    x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;
290
291    x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
292    x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;
293    x4->params.analyse.b_transform_8x8    = avctx->flags2 & CODEC_FLAG2_8X8DCT;
294    x4->params.analyse.b_fast_pskip       = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
295
296    x4->params.analyse.i_trellis          = avctx->trellis;
297    x4->params.analyse.i_noise_reduction  = avctx->noise_reduction;
298
299    if (avctx->level > 0)
300        x4->params.i_level_idc = avctx->level;
301
302    x4->params.rc.f_rate_tolerance =
303        (float)avctx->bit_rate_tolerance/avctx->bit_rate;
304
305    if ((avctx->rc_buffer_size != 0) &&
306        (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
307        x4->params.rc.f_vbv_buffer_init =
308            (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
309    } else
310        x4->params.rc.f_vbv_buffer_init = 0.9;
311
312#if X264_BUILD >= 69
313    x4->params.rc.b_mb_tree               = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);
314#endif
315    x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);
316    x4->params.rc.f_pb_factor             = avctx->b_quant_factor;
317    x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
318
319    x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
320    x4->params.i_log_level    = X264_LOG_DEBUG;
321
322    x4->params.b_aud          = avctx->flags2 & CODEC_FLAG2_AUD;
323
324    x4->params.i_threads      = avctx->thread_count;
325
326    x4->params.b_interlaced   = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
327
328    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
329        x4->params.b_repeat_headers = 0;
330
331    x4->enc = x264_encoder_open(&x4->params);
332    if (!x4->enc)
333        return -1;
334
335    avctx->coded_frame = &x4->out_pic;
336
337#if X264_BUILD >= 76
338    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
339        x264_nal_t *nal;
340        int nnal, s;
341
342        s = x264_encoder_headers(x4->enc, &nal, &nnal);
343
344        avctx->extradata      = av_malloc(s);
345        avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
346    }
347#else
348    if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
349        x264_nal_t *nal;
350        int nnal, i, s = 0;
351
352        x264_encoder_headers(x4->enc, &nal, &nnal);
353
354        /* 5 bytes NAL header + worst case escaping */
355        for (i = 0; i < nnal; i++)
356             s += 5 + nal[i].i_payload * 4 / 3;
357
358        avctx->extradata = av_malloc(s);
359        avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
360    }
361#endif
362
363    return 0;
364}
365
366AVCodec libx264_encoder = {
367    .name           = "libx264",
368    .type           = CODEC_TYPE_VIDEO,
369    .id             = CODEC_ID_H264,
370    .priv_data_size = sizeof(X264Context),
371    .init           = X264_init,
372    .encode         = X264_frame,
373    .close          = X264_close,
374    .capabilities   = CODEC_CAP_DELAY,
375    .pix_fmts       = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
376    .long_name      = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
377};
378