add Chinese AVS encoding via external library libxavs

Originally committed as revision 24533 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 351 insertions, 0 deletions

diff --git a/libavcodec/libxavs.c b/libavcodec/libxavs.c
new file mode 100644
index 0000000000..c4ac73333b
--- /dev/null
+++ b/libavcodec/libxavs.c
@@ -0,0 +1,351 @@
+/*
+ * AVS encoding using the xavs library
+ * Copyright (C) 2010 Amanda, Y.N. Wu <amanda11192003@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <stdint.h>
+#include <xavs.h>
+#include "avcodec.h"
+
+#define END_OF_STREAM 0x001
+
+#define XAVS_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
+#define XAVS_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
+#define XAVS_PART_B8X8 0x100 /* Analyze b16x8, b*/
+
+typedef struct XavsContext {
+    xavs_param_t    params;
+    xavs_t         *enc;
+    xavs_picture_t  pic;
+    uint8_t        *sei;
+    int             sei_size;
+    AVFrame         out_pic;
+    int             end_of_stream;
+} XavsContext;
+
+static void XAVS_log(void *p, int level, const char *fmt, va_list args)
+{
+    static const int level_map[] = {
+        [XAVS_LOG_ERROR]   = AV_LOG_ERROR,
+        [XAVS_LOG_WARNING] = AV_LOG_WARNING,
+        [XAVS_LOG_INFO]    = AV_LOG_INFO,
+        [XAVS_LOG_DEBUG]   = AV_LOG_DEBUG
+    };
+
+    if (level < 0 || level > XAVS_LOG_DEBUG)
+        return;
+
+    av_vlog(p, level_map[level], fmt, args);
+}
+
+static int encode_nals(AVCodecContext *ctx, uint8_t *buf,
+                       int size, xavs_nal_t *nals,
+                       int nnal, int skip_sei)
+{
+    XavsContext *x4 = ctx->priv_data;
+    uint8_t *p = buf;
+    int i, s;
+
+    /* Write the SEI as part of the first frame. */
+    if (x4->sei_size > 0 && nnal > 0) {
+        memcpy(p, x4->sei, x4->sei_size);
+        p += x4->sei_size;
+        x4->sei_size = 0;
+    }
+
+    for (i = 0; i < nnal; i++) {
+        /* Don't put the SEI in extradata. */
+        if (skip_sei && nals[i].i_type == NAL_SEI) {
+            x4->sei = av_malloc( 5 + nals[i].i_payload * 4 / 3 );
+            if (xavs_nal_encode(x4->sei, &x4->sei_size, 1, nals + i) < 0)
+                return -1;
+
+            continue;
+        }
+        s = xavs_nal_encode(p, &size, 1, nals + i);
+        if (s < 0)
+            return -1;
+        p += s;
+    }
+
+    return p - buf;
+}
+
+static int XAVS_frame(AVCodecContext *ctx, uint8_t *buf,
+                      int bufsize, void *data)
+{
+    XavsContext *x4 = ctx->priv_data;
+    AVFrame *frame = data;
+    xavs_nal_t *nal;
+    int nnal, i;
+    xavs_picture_t pic_out;
+
+    x4->pic.img.i_csp   = XAVS_CSP_I420;
+    x4->pic.img.i_plane = 3;
+
+    if (frame) {
+       for (i = 0; i < 3; i++) {
+            x4->pic.img.plane[i] = frame->data[i];
+            x4->pic.img.i_stride[i] = frame->linesize[i];
+       }
+
+        x4->pic.i_pts  = frame->pts;
+        x4->pic.i_type = XAVS_TYPE_AUTO;
+    }
+
+    if (xavs_encoder_encode(x4->enc, &nal, &nnal,
+                            frame? &x4->pic: NULL, &pic_out) < 0)
+    return -1;
+
+    bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
+
+    if (bufsize < 0)
+        return -1;
+
+    if (!bufsize && !frame && !(x4->end_of_stream)){
+        buf[bufsize]   = 0x0;
+        buf[bufsize+1] = 0x0;
+        buf[bufsize+2] = 0x01;
+        buf[bufsize+3] = 0xb1;
+        bufsize += 4;
+        x4->end_of_stream = END_OF_STREAM;
+        return bufsize;
+    }
+    /* FIXME: libxavs now provides DTS */
+    /* but AVFrame doesn't have a field for it. */
+    x4->out_pic.pts = pic_out.i_pts;
+
+    switch (pic_out.i_type) {
+    case XAVS_TYPE_IDR:
+    case XAVS_TYPE_I:
+        x4->out_pic.pict_type = FF_I_TYPE;
+        break;
+    case XAVS_TYPE_P:
+        x4->out_pic.pict_type = FF_P_TYPE;
+        break;
+    case XAVS_TYPE_B:
+    case XAVS_TYPE_BREF:
+        x4->out_pic.pict_type = FF_B_TYPE;
+        break;
+    }
+
+    /* There is no IDR frame in AVS JiZhun */
+    /* Sequence header is used as a flag */
+    x4->out_pic.key_frame = pic_out.i_type == XAVS_TYPE_I;
+
+    x4->out_pic.quality   = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
+
+    return bufsize;
+}
+
+static av_cold int XAVS_close(AVCodecContext *avctx)
+{
+    XavsContext *x4 = avctx->priv_data;
+
+    av_freep(&avctx->extradata);
+    av_free(x4->sei);
+
+    if (x4->enc)
+        xavs_encoder_close(x4->enc);
+
+    return 0;
+}
+
+static av_cold int XAVS_init(AVCodecContext *avctx)
+{
+    XavsContext *x4 = avctx->priv_data;
+
+    x4->sei_size = 0;
+    xavs_param_default(&x4->params);
+
+    x4->params.pf_log               = XAVS_log;
+    x4->params.p_log_private        = avctx;
+    x4->params.i_keyint_max         = avctx->gop_size;
+    x4->params.rc.i_bitrate         = avctx->bit_rate       / 1000;
+    x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
+    x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;
+    x4->params.rc.b_stat_write      = avctx->flags & CODEC_FLAG_PASS1;
+    if (avctx->flags & CODEC_FLAG_PASS2) {
+        x4->params.rc.b_stat_read = 1;
+    } else {
+        if (avctx->crf) {
+            x4->params.rc.i_rc_method   = XAVS_RC_CRF;
+            x4->params.rc.f_rf_constant = avctx->crf;
+        } else if (avctx->cqp > -1) {
+            x4->params.rc.i_rc_method   = XAVS_RC_CQP;
+            x4->params.rc.i_qp_constant = avctx->cqp;
+        }
+    }
+
+    /* if neither crf nor cqp modes are selected we have to enable the RC */
+    /* we do it this way because we cannot check if the bitrate has been set */
+    if (!(avctx->crf || (avctx->cqp > -1)))
+        x4->params.rc.i_rc_method = XAVS_RC_ABR;
+
+    x4->params.i_bframe          = avctx->max_b_frames;
+    /* cabac is not included in AVS JiZhun Profile */
+    x4->params.b_cabac           = 0;
+
+    x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
+    x4->params.i_bframe_bias     = avctx->bframebias;
+
+    avctx->has_b_frames          = !!avctx->max_b_frames;
+
+    /* AVS doesn't allow B picture as reference */
+    /* The max allowed reference frame number of B is 2 */
+    x4->params.i_keyint_min      = avctx->keyint_min;
+    if (x4->params.i_keyint_min > x4->params.i_keyint_max)
+        x4->params.i_keyint_min = x4->params.i_keyint_max;
+
+    x4->params.i_scenecut_threshold        = avctx->scenechange_threshold;
+
+   // x4->params.b_deblocking_filter       = avctx->flags & CODEC_FLAG_LOOP_FILTER;
+    x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
+    x4->params.i_deblocking_filter_beta    = avctx->deblockbeta;
+
+    x4->params.rc.i_qp_min                 = avctx->qmin;
+    x4->params.rc.i_qp_max                 = avctx->qmax;
+    x4->params.rc.i_qp_step                = avctx->max_qdiff;
+
+    x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
+    x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */
+    x4->params.rc.f_complexity_blur = avctx->complexityblur;
+
+    x4->params.i_frame_reference    = avctx->refs;
+
+    x4->params.i_width              = avctx->width;
+    x4->params.i_height             = avctx->height;
+    x4->params.vui.i_sar_width      = avctx->sample_aspect_ratio.num;
+    x4->params.vui.i_sar_height     = avctx->sample_aspect_ratio.den;
+    /* This is only used for counting the fps */
+    x4->params.i_fps_num            = avctx->time_base.den;
+    x4->params.i_fps_den            = avctx->time_base.num;
+    x4->params.analyse.inter        = XAVS_ANALYSE_I8x8 |XAVS_ANALYSE_PSUB16x16| XAVS_ANALYSE_BSUB16x16;
+    if (avctx->partitions) {
+        if (avctx->partitions & XAVS_PART_I8X8)
+            x4->params.analyse.inter |= XAVS_ANALYSE_I8x8;
+
+        if (avctx->partitions & XAVS_PART_P8X8)
+            x4->params.analyse.inter |= XAVS_ANALYSE_PSUB16x16;
+
+        if (avctx->partitions & XAVS_PART_B8X8)
+            x4->params.analyse.inter |= XAVS_ANALYSE_BSUB16x16;
+    }
+
+    x4->params.analyse.i_direct_mv_pred  = avctx->directpred;
+
+    x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
+
+    switch (avctx->me_method) {
+         case  ME_EPZS:
+               x4->params.analyse.i_me_method = XAVS_ME_DIA;
+               break;
+         case  ME_HEX:
+               x4->params.analyse.i_me_method = XAVS_ME_HEX;
+               break;
+         case  ME_UMH:
+               x4->params.analyse.i_me_method = XAVS_ME_UMH;
+               break;
+         case  ME_FULL:
+               x4->params.analyse.i_me_method = XAVS_ME_ESA;
+               break;
+         case  ME_TESA:
+               x4->params.analyse.i_me_method = XAVS_ME_TESA;
+               break;
+         default:
+               x4->params.analyse.i_me_method = XAVS_ME_HEX;
+    }
+
+    x4->params.analyse.i_me_range = avctx->me_range;
+    x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;
+
+    x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
+    x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;
+    /* AVS P2 only enables 8x8 transform */
+    x4->params.analyse.b_transform_8x8    = 1; //avctx->flags2 & CODEC_FLAG2_8X8DCT;
+    x4->params.analyse.b_fast_pskip       = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
+
+    x4->params.analyse.i_trellis          = avctx->trellis;
+    x4->params.analyse.i_noise_reduction  = avctx->noise_reduction;
+
+    if (avctx->level > 0)
+        x4->params.i_level_idc = avctx->level;
+
+    x4->params.rc.f_rate_tolerance =
+        (float)avctx->bit_rate_tolerance/avctx->bit_rate;
+
+    if ((avctx->rc_buffer_size) &&
+        (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
+        x4->params.rc.f_vbv_buffer_init =
+            (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
+    } else
+        x4->params.rc.f_vbv_buffer_init = 0.9;
+
+    /* TAG:do we have MB tree RC method */
+    /* what is the RC method we are now using? Default NO */
+    x4->params.rc.b_mb_tree               = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);
+    x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);
+    x4->params.rc.f_pb_factor             = avctx->b_quant_factor;
+    x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
+
+    x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
+    x4->params.i_log_level    = XAVS_LOG_DEBUG;
+    x4->params.b_aud          = avctx->flags2 & CODEC_FLAG2_AUD;
+    x4->params.i_threads      = avctx->thread_count;
+    x4->params.b_interlaced   = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
+
+    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
+        x4->params.b_repeat_headers = 0;
+
+    x4->enc = xavs_encoder_open(&x4->params);
+    if (!x4->enc)
+        return -1;
+
+    avctx->coded_frame = &x4->out_pic;
+    /* TAG: Do we have GLOBAL HEADER in AVS */
+    /* We Have PPS and SPS in AVS */
+    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
+        xavs_nal_t *nal;
+        int nnal, s;
+
+        s = xavs_encoder_headers(x4->enc, &nal, &nnal);
+
+        avctx->extradata      = av_malloc(s);
+        avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
+    }
+    return 0;
+}
+
+AVCodec libxavs_encoder = {
+    .name           = "libxavs",
+    .type           = CODEC_TYPE_VIDEO,
+    .id             = CODEC_ID_CAVS,
+    .priv_data_size = sizeof(XavsContext),
+    .init           = XAVS_init,
+    .encode         = XAVS_frame,
+    .close          = XAVS_close,
+    .capabilities   = CODEC_CAP_DELAY,
+    .pix_fmts       = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
+    .long_name      = NULL_IF_CONFIG_SMALL("libxavs - the Chinese Audio Video Standard Encoder"),
+};
+