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ffmpeg / libavcodec / libvpxenc.c @ 8eeed0db

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1
/*
2
 * Copyright (c) 2010, Google, Inc.
3
 *
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 * This file is part of FFmpeg.
5
 *
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 * 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
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * 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.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
20

    
21
/**
22
 * @file
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 * VP8 encoder support via libvpx
24
 */
25

    
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#define VPX_DISABLE_CTRL_TYPECHECKS 1
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#define VPX_CODEC_DISABLE_COMPAT    1
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#include <vpx/vpx_encoder.h>
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#include <vpx/vp8cx.h>
30

    
31
#include "avcodec.h"
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#include "libavutil/base64.h"
33

    
34
/**
35
 * Portion of struct vpx_codec_cx_pkt from vpx_encoder.h.
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 * One encoded frame returned from the library.
37
 */
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struct FrameListData {
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    void *buf;                       /**< compressed data buffer */
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    size_t sz;                       /**< length of compressed data */
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    int64_t pts;                     /**< time stamp to show frame
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                                          (in timebase units) */
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    unsigned long duration;          /**< duration to show frame
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                                          (in timebase units) */
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    uint32_t flags;                  /**< flags for this frame */
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    struct FrameListData *next;
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};
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typedef struct VP8EncoderContext {
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    struct vpx_codec_ctx encoder;
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    struct vpx_image rawimg;
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    struct vpx_fixed_buf twopass_stats;
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    unsigned long deadline; //i.e., RT/GOOD/BEST
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    struct FrameListData *coded_frame_list;
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} VP8Context;
56

    
57
/** String mappings for enum vp8e_enc_control_id */
58
static const char *ctlidstr[] = {
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    [VP8E_UPD_ENTROPY]           = "VP8E_UPD_ENTROPY",
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    [VP8E_UPD_REFERENCE]         = "VP8E_UPD_REFERENCE",
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    [VP8E_USE_REFERENCE]         = "VP8E_USE_REFERENCE",
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    [VP8E_SET_ROI_MAP]           = "VP8E_SET_ROI_MAP",
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    [VP8E_SET_ACTIVEMAP]         = "VP8E_SET_ACTIVEMAP",
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    [VP8E_SET_SCALEMODE]         = "VP8E_SET_SCALEMODE",
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    [VP8E_SET_CPUUSED]           = "VP8E_SET_CPUUSED",
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    [VP8E_SET_ENABLEAUTOALTREF]  = "VP8E_SET_ENABLEAUTOALTREF",
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    [VP8E_SET_NOISE_SENSITIVITY] = "VP8E_SET_NOISE_SENSITIVITY",
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    [VP8E_SET_SHARPNESS]         = "VP8E_SET_SHARPNESS",
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    [VP8E_SET_STATIC_THRESHOLD]  = "VP8E_SET_STATIC_THRESHOLD",
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    [VP8E_SET_TOKEN_PARTITIONS]  = "VP8E_SET_TOKEN_PARTITIONS",
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    [VP8E_GET_LAST_QUANTIZER]    = "VP8E_GET_LAST_QUANTIZER",
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    [VP8E_SET_ARNR_MAXFRAMES]    = "VP8E_SET_ARNR_MAXFRAMES",
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    [VP8E_SET_ARNR_STRENGTH]     = "VP8E_SET_ARNR_STRENGTH",
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    [VP8E_SET_ARNR_TYPE]         = "VP8E_SET_ARNR_TYPE",
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    [VP8E_SET_CQ_LEVEL]          = "VP8E_SET_CQ_LEVEL",
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};
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78
static av_cold void log_encoder_error(AVCodecContext *avctx, const char *desc)
79
{
80
    VP8Context *ctx = avctx->priv_data;
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    const char *error  = vpx_codec_error(&ctx->encoder);
82
    const char *detail = vpx_codec_error_detail(&ctx->encoder);
83

    
84
    av_log(avctx, AV_LOG_ERROR, "%s: %s\n", desc, error);
85
    if (detail)
86
        av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n", detail);
87
}
88

    
89
static av_cold void dump_enc_cfg(AVCodecContext *avctx,
90
                                 const struct vpx_codec_enc_cfg *cfg)
91
{
92
    int width = -30;
93
    int level = AV_LOG_DEBUG;
94

    
95
    av_log(avctx, level, "vpx_codec_enc_cfg\n");
96
    av_log(avctx, level, "generic settings\n"
97
           "  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n"
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           "  %*s{%u/%u}\n  %*s%u\n  %*s%d\n  %*s%u\n",
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           width, "g_usage:",           cfg->g_usage,
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           width, "g_threads:",         cfg->g_threads,
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           width, "g_profile:",         cfg->g_profile,
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           width, "g_w:",               cfg->g_w,
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           width, "g_h:",               cfg->g_h,
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           width, "g_timebase:",        cfg->g_timebase.num, cfg->g_timebase.den,
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           width, "g_error_resilient:", cfg->g_error_resilient,
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           width, "g_pass:",            cfg->g_pass,
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           width, "g_lag_in_frames:",   cfg->g_lag_in_frames);
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    av_log(avctx, level, "rate control settings\n"
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           "  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n"
110
           "  %*s%d\n  %*s%p(%zu)\n  %*s%u\n",
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           width, "rc_dropframe_thresh:",   cfg->rc_dropframe_thresh,
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           width, "rc_resize_allowed:",     cfg->rc_resize_allowed,
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           width, "rc_resize_up_thresh:",   cfg->rc_resize_up_thresh,
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           width, "rc_resize_down_thresh:", cfg->rc_resize_down_thresh,
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           width, "rc_end_usage:",          cfg->rc_end_usage,
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           width, "rc_twopass_stats_in:",   cfg->rc_twopass_stats_in.buf, cfg->rc_twopass_stats_in.sz,
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           width, "rc_target_bitrate:",     cfg->rc_target_bitrate);
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    av_log(avctx, level, "quantizer settings\n"
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           "  %*s%u\n  %*s%u\n",
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           width, "rc_min_quantizer:", cfg->rc_min_quantizer,
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           width, "rc_max_quantizer:", cfg->rc_max_quantizer);
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    av_log(avctx, level, "bitrate tolerance\n"
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           "  %*s%u\n  %*s%u\n",
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           width, "rc_undershoot_pct:", cfg->rc_undershoot_pct,
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           width, "rc_overshoot_pct:",  cfg->rc_overshoot_pct);
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    av_log(avctx, level, "decoder buffer model\n"
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            "  %*s%u\n  %*s%u\n  %*s%u\n",
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            width, "rc_buf_sz:",         cfg->rc_buf_sz,
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            width, "rc_buf_initial_sz:", cfg->rc_buf_initial_sz,
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            width, "rc_buf_optimal_sz:", cfg->rc_buf_optimal_sz);
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    av_log(avctx, level, "2 pass rate control settings\n"
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           "  %*s%u\n  %*s%u\n  %*s%u\n",
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           width, "rc_2pass_vbr_bias_pct:",       cfg->rc_2pass_vbr_bias_pct,
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           width, "rc_2pass_vbr_minsection_pct:", cfg->rc_2pass_vbr_minsection_pct,
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           width, "rc_2pass_vbr_maxsection_pct:", cfg->rc_2pass_vbr_maxsection_pct);
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    av_log(avctx, level, "keyframing settings\n"
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           "  %*s%d\n  %*s%u\n  %*s%u\n",
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           width, "kf_mode:",     cfg->kf_mode,
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           width, "kf_min_dist:", cfg->kf_min_dist,
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           width, "kf_max_dist:", cfg->kf_max_dist);
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    av_log(avctx, level, "\n");
142
}
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144
static void coded_frame_add(void *list, struct FrameListData *cx_frame)
145
{
146
    struct FrameListData **p = list;
147

    
148
    while (*p != NULL)
149
        p = &(*p)->next;
150
    *p = cx_frame;
151
    cx_frame->next = NULL;
152
}
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154
static av_cold void free_coded_frame(struct FrameListData *cx_frame)
155
{
156
    av_freep(&cx_frame->buf);
157
    av_freep(&cx_frame);
158
}
159

    
160
static av_cold void free_frame_list(struct FrameListData *list)
161
{
162
    struct FrameListData *p = list;
163

    
164
    while (p) {
165
        list = list->next;
166
        free_coded_frame(p);
167
        p = list;
168
    }
169
}
170

    
171
static av_cold int codecctl_int(AVCodecContext *avctx,
172
                                enum vp8e_enc_control_id id, int val)
173
{
174
    VP8Context *ctx = avctx->priv_data;
175
    char buf[80];
176
    int width = -30;
177
    int res;
178

    
179
    snprintf(buf, sizeof(buf), "%s:", ctlidstr[id]);
180
    av_log(avctx, AV_LOG_DEBUG, "  %*s%d\n", width, buf, val);
181

    
182
    res = vpx_codec_control(&ctx->encoder, id, val);
183
    if (res != VPX_CODEC_OK) {
184
        snprintf(buf, sizeof(buf), "Failed to set %s codec control",
185
                 ctlidstr[id]);
186
        log_encoder_error(avctx, buf);
187
    }
188

    
189
    return res == VPX_CODEC_OK ? 0 : AVERROR(EINVAL);
190
}
191

    
192
static av_cold int vp8_free(AVCodecContext *avctx)
193
{
194
    VP8Context *ctx = avctx->priv_data;
195

    
196
    vpx_codec_destroy(&ctx->encoder);
197
    av_freep(&ctx->twopass_stats.buf);
198
    av_freep(&avctx->coded_frame);
199
    av_freep(&avctx->stats_out);
200
    free_frame_list(ctx->coded_frame_list);
201
    return 0;
202
}
203

    
204
static av_cold int vp8_init(AVCodecContext *avctx)
205
{
206
    VP8Context *ctx = avctx->priv_data;
207
    const struct vpx_codec_iface *iface = &vpx_codec_vp8_cx_algo;
208
    int cpuused = 3;
209
    struct vpx_codec_enc_cfg enccfg;
210
    int res;
211

    
212
    av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
213
    av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
214

    
215
    if ((res = vpx_codec_enc_config_default(iface, &enccfg, 0)) != VPX_CODEC_OK) {
216
        av_log(avctx, AV_LOG_ERROR, "Failed to get config: %s\n",
217
               vpx_codec_err_to_string(res));
218
        return AVERROR(EINVAL);
219
    }
220
    dump_enc_cfg(avctx, &enccfg);
221

    
222
    enccfg.g_w            = avctx->width;
223
    enccfg.g_h            = avctx->height;
224
    enccfg.g_timebase.num = avctx->time_base.num;
225
    enccfg.g_timebase.den = avctx->time_base.den;
226
    enccfg.g_threads      = avctx->thread_count;
227

    
228
    if (avctx->flags & CODEC_FLAG_PASS1)
229
        enccfg.g_pass = VPX_RC_FIRST_PASS;
230
    else if (avctx->flags & CODEC_FLAG_PASS2)
231
        enccfg.g_pass = VPX_RC_LAST_PASS;
232
    else
233
        enccfg.g_pass = VPX_RC_ONE_PASS;
234

    
235
    if (avctx->rc_min_rate == avctx->rc_max_rate &&
236
        avctx->rc_min_rate == avctx->bit_rate)
237
        enccfg.rc_end_usage = VPX_CBR;
238
    else if (avctx->crf)
239
        enccfg.rc_end_usage = VPX_CQ;
240
    enccfg.rc_target_bitrate = av_rescale_rnd(avctx->bit_rate, 1, 1000,
241
                                              AV_ROUND_NEAR_INF);
242

    
243
    enccfg.rc_min_quantizer = avctx->qmin;
244
    enccfg.rc_max_quantizer = avctx->qmax;
245
    enccfg.rc_dropframe_thresh = avctx->frame_skip_threshold;
246

    
247
    //0-100 (0 => CBR, 100 => VBR)
248
    enccfg.rc_2pass_vbr_bias_pct           = round(avctx->qcompress * 100);
249
    enccfg.rc_2pass_vbr_minsection_pct     =
250
        avctx->rc_min_rate * 100LL / avctx->bit_rate;
251
    if (avctx->rc_max_rate)
252
        enccfg.rc_2pass_vbr_maxsection_pct =
253
            avctx->rc_max_rate * 100LL / avctx->bit_rate;
254

    
255
    if (avctx->rc_buffer_size)
256
        enccfg.rc_buf_sz         =
257
            avctx->rc_buffer_size * 1000LL / avctx->bit_rate;
258
    if (avctx->rc_initial_buffer_occupancy)
259
        enccfg.rc_buf_initial_sz =
260
            avctx->rc_initial_buffer_occupancy * 1000LL / avctx->bit_rate;
261
    enccfg.rc_buf_optimal_sz     = enccfg.rc_buf_sz * 5 / 6;
262

    
263
    //_enc_init() will balk if kf_min_dist differs from max w/VPX_KF_AUTO
264
    if (avctx->keyint_min == avctx->gop_size)
265
        enccfg.kf_min_dist = avctx->keyint_min;
266
    enccfg.kf_max_dist     = avctx->gop_size;
267

    
268
    if (enccfg.g_pass == VPX_RC_FIRST_PASS)
269
        enccfg.g_lag_in_frames = 0;
270
    else if (enccfg.g_pass == VPX_RC_LAST_PASS) {
271
        int decode_size;
272

    
273
        if (!avctx->stats_in) {
274
            av_log(avctx, AV_LOG_ERROR, "No stats file for second pass\n");
275
            return AVERROR_INVALIDDATA;
276
        }
277

    
278
        ctx->twopass_stats.sz  = strlen(avctx->stats_in) * 3 / 4;
279
        ctx->twopass_stats.buf = av_malloc(ctx->twopass_stats.sz);
280
        if (!ctx->twopass_stats.buf) {
281
            av_log(avctx, AV_LOG_ERROR,
282
                   "Stat buffer alloc (%zu bytes) failed\n",
283
                   ctx->twopass_stats.sz);
284
            return AVERROR(ENOMEM);
285
        }
286
        decode_size = av_base64_decode(ctx->twopass_stats.buf, avctx->stats_in,
287
                                       ctx->twopass_stats.sz);
288
        if (decode_size < 0) {
289
            av_log(avctx, AV_LOG_ERROR, "Stat buffer decode failed\n");
290
            return AVERROR_INVALIDDATA;
291
        }
292

    
293
        ctx->twopass_stats.sz      = decode_size;
294
        enccfg.rc_twopass_stats_in = ctx->twopass_stats;
295
    }
296

    
297
    ctx->deadline = VPX_DL_GOOD_QUALITY;
298
    /* 0-3: For non-zero values the encoder increasingly optimizes for reduced
299
       complexity playback on low powered devices at the expense of encode
300
       quality. */
301
   if (avctx->profile != FF_PROFILE_UNKNOWN)
302
       enccfg.g_profile = avctx->profile;
303

    
304
    dump_enc_cfg(avctx, &enccfg);
305
    /* Construct Encoder Context */
306
    res = vpx_codec_enc_init(&ctx->encoder, iface, &enccfg, 0);
307
    if (res != VPX_CODEC_OK) {
308
        log_encoder_error(avctx, "Failed to initialize encoder");
309
        return AVERROR(EINVAL);
310
    }
311

    
312
    //codec control failures are currently treated only as warnings
313
    av_log(avctx, AV_LOG_DEBUG, "vpx_codec_control\n");
314
    codecctl_int(avctx, VP8E_SET_CPUUSED,           cpuused);
315
    codecctl_int(avctx, VP8E_SET_NOISE_SENSITIVITY, avctx->noise_reduction);
316
    codecctl_int(avctx, VP8E_SET_TOKEN_PARTITIONS,  av_log2(avctx->slices));
317
    codecctl_int(avctx, VP8E_SET_STATIC_THRESHOLD,  avctx->mb_threshold);
318
    codecctl_int(avctx, VP8E_SET_CQ_LEVEL,          (int)avctx->crf);
319

    
320
    //provide dummy value to initialize wrapper, values will be updated each _encode()
321
    vpx_img_wrap(&ctx->rawimg, VPX_IMG_FMT_I420, avctx->width, avctx->height, 1,
322
                 (unsigned char*)1);
323

    
324
    avctx->coded_frame = avcodec_alloc_frame();
325
    if (!avctx->coded_frame) {
326
        av_log(avctx, AV_LOG_ERROR, "Error allocating coded frame\n");
327
        vp8_free(avctx);
328
        return AVERROR(ENOMEM);
329
    }
330
    return 0;
331
}
332

    
333
static inline void cx_pktcpy(struct FrameListData *dst,
334
                             const struct vpx_codec_cx_pkt *src)
335
{
336
    dst->pts      = src->data.frame.pts;
337
    dst->duration = src->data.frame.duration;
338
    dst->flags    = src->data.frame.flags;
339
    dst->sz       = src->data.frame.sz;
340
    dst->buf      = src->data.frame.buf;
341
}
342

    
343
/**
344
 * Store coded frame information in format suitable for return from encode().
345
 *
346
 * Write buffer information from @a cx_frame to @a buf & @a buf_size.
347
 * Timing/frame details to @a coded_frame.
348
 * @return Frame size written to @a buf on success
349
 * @return AVERROR(EINVAL) on error
350
 */
351
static int storeframe(AVCodecContext *avctx, struct FrameListData *cx_frame,
352
                      uint8_t *buf, int buf_size, AVFrame *coded_frame)
353
{
354
    if ((int) cx_frame->sz <= buf_size) {
355
        buf_size = cx_frame->sz;
356
        memcpy(buf, cx_frame->buf, buf_size);
357
        coded_frame->pts       = cx_frame->pts;
358
        coded_frame->key_frame = !!(cx_frame->flags & VPX_FRAME_IS_KEY);
359

    
360
        if (coded_frame->key_frame)
361
            coded_frame->pict_type = FF_I_TYPE;
362
        else
363
            coded_frame->pict_type = FF_P_TYPE;
364
    } else {
365
        av_log(avctx, AV_LOG_ERROR,
366
               "Compressed frame larger than storage provided! (%zu/%d)\n",
367
               cx_frame->sz, buf_size);
368
        return AVERROR(EINVAL);
369
    }
370
    return buf_size;
371
}
372

    
373
/**
374
 * Queue multiple output frames from the encoder, returning the front-most.
375
 * In cases where vpx_codec_get_cx_data() returns more than 1 frame append
376
 * the frame queue. Return the head frame if available.
377
 * @return Stored frame size
378
 * @return AVERROR(EINVAL) on output size error
379
 * @return AVERROR(ENOMEM) on coded frame queue data allocation error
380
 */
381
static int queue_frames(AVCodecContext *avctx, uint8_t *buf, int buf_size,
382
                        AVFrame *coded_frame)
383
{
384
    VP8Context *ctx = avctx->priv_data;
385
    const struct vpx_codec_cx_pkt *pkt;
386
    const void *iter = NULL;
387
    int size = 0;
388

    
389
    if (ctx->coded_frame_list) {
390
        struct FrameListData *cx_frame = ctx->coded_frame_list;
391
        /* return the leading frame if we've already begun queueing */
392
        size = storeframe(avctx, cx_frame, buf, buf_size, coded_frame);
393
        if (size < 0)
394
            return AVERROR(EINVAL);
395
        ctx->coded_frame_list = cx_frame->next;
396
        free_coded_frame(cx_frame);
397
    }
398

    
399
    /* consume all available output from the encoder before returning. buffers
400
       are only good through the next vpx_codec call */
401
    while ((pkt = vpx_codec_get_cx_data(&ctx->encoder, &iter))) {
402
        switch (pkt->kind) {
403
        case VPX_CODEC_CX_FRAME_PKT:
404
            if (!size) {
405
                struct FrameListData cx_frame;
406

    
407
                /* avoid storing the frame when the list is empty and we haven't yet
408
                   provided a frame for output */
409
                assert(!ctx->coded_frame_list);
410
                cx_pktcpy(&cx_frame, pkt);
411
                size = storeframe(avctx, &cx_frame, buf, buf_size, coded_frame);
412
                if (size < 0)
413
                    return AVERROR(EINVAL);
414
            } else {
415
                struct FrameListData *cx_frame =
416
                    av_malloc(sizeof(struct FrameListData));
417

    
418
                if (!cx_frame) {
419
                    av_log(avctx, AV_LOG_ERROR,
420
                           "Frame queue element alloc failed\n");
421
                    return AVERROR(ENOMEM);
422
                }
423
                cx_pktcpy(cx_frame, pkt);
424
                cx_frame->buf = av_malloc(cx_frame->sz);
425

    
426
                if (!cx_frame->buf) {
427
                    av_log(avctx, AV_LOG_ERROR,
428
                           "Data buffer alloc (%zu bytes) failed\n",
429
                           cx_frame->sz);
430
                    return AVERROR(ENOMEM);
431
                }
432
                memcpy(cx_frame->buf, pkt->data.frame.buf, pkt->data.frame.sz);
433
                coded_frame_add(&ctx->coded_frame_list, cx_frame);
434
            }
435
            break;
436
        case VPX_CODEC_STATS_PKT: {
437
            struct vpx_fixed_buf *stats = &ctx->twopass_stats;
438
            stats->buf = av_realloc(stats->buf,
439
                                    stats->sz + pkt->data.twopass_stats.sz);
440
            if (!stats->buf) {
441
                av_log(avctx, AV_LOG_ERROR, "Stat buffer realloc failed\n");
442
                return AVERROR(ENOMEM);
443
            }
444
            memcpy((uint8_t*)stats->buf + stats->sz,
445
                   pkt->data.twopass_stats.buf, pkt->data.twopass_stats.sz);
446
            stats->sz += pkt->data.twopass_stats.sz;
447
            break;
448
        }
449
        case VPX_CODEC_PSNR_PKT: //FIXME add support for CODEC_FLAG_PSNR
450
        case VPX_CODEC_CUSTOM_PKT:
451
            //ignore unsupported/unrecognized packet types
452
            break;
453
        }
454
    }
455

    
456
    return size;
457
}
458

    
459
static int vp8_encode(AVCodecContext *avctx, uint8_t *buf, int buf_size,
460
                      void *data)
461
{
462
    VP8Context *ctx = avctx->priv_data;
463
    AVFrame *frame = data;
464
    struct vpx_image *rawimg = NULL;
465
    int64_t timestamp = 0;
466
    int res, coded_size;
467

    
468
    if (frame) {
469
        rawimg                      = &ctx->rawimg;
470
        rawimg->planes[VPX_PLANE_Y] = frame->data[0];
471
        rawimg->planes[VPX_PLANE_U] = frame->data[1];
472
        rawimg->planes[VPX_PLANE_V] = frame->data[2];
473
        rawimg->stride[VPX_PLANE_Y] = frame->linesize[0];
474
        rawimg->stride[VPX_PLANE_U] = frame->linesize[1];
475
        rawimg->stride[VPX_PLANE_V] = frame->linesize[2];
476
        timestamp                   = frame->pts;
477
    }
478

    
479
    res = vpx_codec_encode(&ctx->encoder, rawimg, timestamp,
480
                           avctx->ticks_per_frame, 0, ctx->deadline);
481
    if (res != VPX_CODEC_OK) {
482
        log_encoder_error(avctx, "Error encoding frame");
483
        return AVERROR_INVALIDDATA;
484
    }
485
    coded_size = queue_frames(avctx, buf, buf_size, avctx->coded_frame);
486

    
487
    if (!frame && avctx->flags & CODEC_FLAG_PASS1) {
488
        unsigned int b64_size = AV_BASE64_SIZE(ctx->twopass_stats.sz);
489

    
490
        avctx->stats_out = av_malloc(b64_size);
491
        if (!avctx->stats_out) {
492
            av_log(avctx, AV_LOG_ERROR, "Stat buffer alloc (%d bytes) failed\n",
493
                   b64_size);
494
            return AVERROR(ENOMEM);
495
        }
496
        av_base64_encode(avctx->stats_out, b64_size, ctx->twopass_stats.buf,
497
                         ctx->twopass_stats.sz);
498
    }
499
    return coded_size;
500
}
501

    
502
AVCodec ff_libvpx_encoder = {
503
    "libvpx",
504
    AVMEDIA_TYPE_VIDEO,
505
    CODEC_ID_VP8,
506
    sizeof(VP8Context),
507
    vp8_init,
508
    vp8_encode,
509
    vp8_free,
510
    NULL,
511
    CODEC_CAP_DELAY,
512
    .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
513
    .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
514
};