[FFmpeg-devel,v6] - Added Turing codec interface for ffmpeg

diff --git a/LICENSE.md b/LICENSE.md
index 640633c..86e5371 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -85,6 +85,7 @@  The following libraries are under GPL:
 - frei0r
 - libcdio
 - librubberband
+- libturing
 - libvidstab
 - libx264
 - libx265
diff --git a/configure b/configure
index 7154142..a27cb8b 100755
--- a/configure
+++ b/configure
@@ -255,6 +255,7 @@  External library support:
   --enable-libssh          enable SFTP protocol via libssh [no]
   --enable-libtesseract    enable Tesseract, needed for ocr filter [no]
   --enable-libtheora       enable Theora encoding via libtheora [no]
+  --enable-libturing       enable H.265/HEVC encoding via libturing [no]
   --enable-libtwolame      enable MP2 encoding via libtwolame [no]
   --enable-libv4l2         enable libv4l2/v4l-utils [no]
   --enable-libvidstab      enable video stabilization using vid.stab [no]
@@ -1562,6 +1563,7 @@  EXTERNAL_LIBRARY_LIST="
     libssh
     libtesseract
     libtheora
+    libturing
     libtwolame
     libv4l2
     libvidstab
@@ -2858,6 +2860,7 @@  libspeex_decoder_deps="libspeex"
 libspeex_encoder_deps="libspeex"
 libspeex_encoder_select="audio_frame_queue"
 libtheora_encoder_deps="libtheora"
+libturing_encoder_deps="libturing"
 libtwolame_encoder_deps="libtwolame"
 libvo_amrwbenc_encoder_deps="libvo_amrwbenc"
 libvorbis_decoder_deps="libvorbis"
@@ -5131,6 +5134,7 @@  die_license_disabled gpl frei0r
 die_license_disabled gpl libcdio
 die_license_disabled gpl librubberband
 die_license_disabled gpl libsmbclient
+die_license_disabled gpl libturing
 die_license_disabled gpl libvidstab
 die_license_disabled gpl libx264
 die_license_disabled gpl libx265
@@ -5789,6 +5793,7 @@  enabled libssh            && require_pkg_config libssh libssh/sftp.h sftp_init
 enabled libspeex          && require_pkg_config speex speex/speex.h speex_decoder_init -lspeex
 enabled libtesseract      && require_pkg_config tesseract tesseract/capi.h TessBaseAPICreate
 enabled libtheora         && require libtheora theora/theoraenc.h th_info_init -ltheoraenc -ltheoradec -logg
+enabled libturing         && require_pkg_config libturing turing.h turing_version
 enabled libtwolame        && require libtwolame twolame.h twolame_init -ltwolame &&
                              { check_lib twolame.h twolame_encode_buffer_float32_interleaved -ltwolame ||
                                die "ERROR: libtwolame must be installed and version must be >= 0.3.10"; }
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 43a6add..de5af1d 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -883,6 +883,7 @@  OBJS-$(CONFIG_LIBSHINE_ENCODER)           += libshine.o
 OBJS-$(CONFIG_LIBSPEEX_DECODER)           += libspeexdec.o
 OBJS-$(CONFIG_LIBSPEEX_ENCODER)           += libspeexenc.o
 OBJS-$(CONFIG_LIBTHEORA_ENCODER)          += libtheoraenc.o
+OBJS-$(CONFIG_LIBTURING_ENCODER)          += libturing.o
 OBJS-$(CONFIG_LIBTWOLAME_ENCODER)         += libtwolame.o
 OBJS-$(CONFIG_LIBVO_AMRWBENC_ENCODER)     += libvo-amrwbenc.o
 OBJS-$(CONFIG_LIBVORBIS_DECODER)          += libvorbisdec.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index f92b2b7..f650591 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -615,6 +615,7 @@  void avcodec_register_all(void)
     REGISTER_ENCODER(LIBSHINE,          libshine);
     REGISTER_ENCDEC (LIBSPEEX,          libspeex);
     REGISTER_ENCODER(LIBTHEORA,         libtheora);
+    REGISTER_ENCODER(LIBTURING,         libturing);
     REGISTER_ENCODER(LIBTWOLAME,        libtwolame);
     REGISTER_ENCODER(LIBVO_AMRWBENC,    libvo_amrwbenc);
     REGISTER_ENCDEC (LIBVORBIS,         libvorbis);
diff --git a/libavcodec/libturing.c b/libavcodec/libturing.c
new file mode 100644
index 0000000..e796b1c
--- /dev/null
+++ b/libavcodec/libturing.c
@@ -0,0 +1,320 @@ 
+/*
+ * libturing encoder
+ *
+ * Copyright (c) 2017 Turing Codec contributors
+ *
+ * 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 <turing.h>
+#include "libavutil/internal.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avcodec.h"
+#include "internal.h"
+
+#define MAX_OPTION_LENGTH 256
+
+typedef struct libturingEncodeContext {
+    const AVClass *class;
+    turing_encoder *encoder;
+    const char *options;
+} libturingEncodeContext;
+
+typedef struct optionContext {
+    char** argv;
+    char* options;
+    char* s;
+    int options_buffer_size;
+    int buffer_filled;
+    int options_added;
+} optionContext;
+
+static av_cold int libturing_encode_close(AVCodecContext *avctx)
+{
+    libturingEncodeContext *ctx = avctx->priv_data;
+
+    if (ctx->encoder) {
+        turing_destroy_encoder(ctx->encoder);
+    }
+    return 0;
+}
+
+static av_cold int add_option(const char* current_option, optionContext* option_ctx)
+{
+    int option_length = strlen(current_option);
+    char *temp_ptr;
+
+
+    if (option_ctx->buffer_filled + option_length + 1 > option_ctx->options_buffer_size) {
+        if(option_ctx->options == NULL) {
+            option_ctx->options = av_malloc(option_length + 1);
+            if(option_ctx->options == NULL) {
+                return AVERROR(ENOMEM);
+            }
+        } else {
+            temp_ptr = av_realloc(option_ctx->options, option_ctx->options_buffer_size + option_length + 1);
+            if (temp_ptr == NULL) {
+                return AVERROR(ENOMEM);
+            }
+            option_ctx->options = temp_ptr;
+        }
+        option_ctx->options_buffer_size += option_length + 1;
+        option_ctx->s = option_ctx->options + option_ctx->buffer_filled;
+    }
+    strcpy(option_ctx->s, current_option);
+    option_ctx->s += 1 + option_length;
+    option_ctx->options_added++;
+    option_ctx->buffer_filled += option_length + 1;
+    return 0;
+}
+
+static av_cold int finalise_options(optionContext* option_ctx)
+{
+    if (option_ctx->options_added) {
+        char *p;
+        option_ctx->argv = av_malloc(option_ctx->options_added * sizeof(char*));
+        if (option_ctx->argv == NULL) {
+            return AVERROR(ENOMEM);
+        }
+        p = option_ctx->options;
+        for(int option_idx=0; option_idx<option_ctx->options_added; option_idx++) {
+            option_ctx->argv[option_idx] = p;
+            p += strlen(p) + 1;
+        }
+    }
+    return 0;
+}
+
+static av_cold int libturing_encode_init(AVCodecContext *avctx)
+{
+    libturingEncodeContext *ctx = avctx->priv_data;
+    const int bit_depth = av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth;
+    int error_code = 0;
+
+    optionContext encoder_options;
+    turing_encoder_settings settings;
+    char option_string[MAX_OPTION_LENGTH];
+    double frame_rate;
+
+    frame_rate = (double)avctx->time_base.den / (avctx->time_base.num * avctx->ticks_per_frame);
+
+    encoder_options.buffer_filled = 0;
+    encoder_options.options_added = 0;
+    encoder_options.options_buffer_size = 0;
+    encoder_options.options = NULL;
+    encoder_options.s = encoder_options.options;
+    encoder_options.argv = NULL;
+
+    // Add baseline command line options
+    if ((error_code = add_option("turing", &encoder_options)) > 0) {
+        goto fail;
+    }
+
+    if ((error_code = add_option("--frames=0", &encoder_options)) > 0) {
+        goto fail;
+    }
+
+    snprintf(option_string, MAX_OPTION_LENGTH, "--input-res=%dx%d", avctx->width, avctx->height);
+    if ((error_code = add_option(option_string, &encoder_options)) > 0) {
+        goto fail;
+    }
+
+    snprintf(option_string, MAX_OPTION_LENGTH, "--frame-rate=%f", frame_rate);
+    if ((error_code = add_option(option_string, &encoder_options)) > 0) {
+        goto fail;
+    }
+
+    snprintf(option_string, MAX_OPTION_LENGTH, "--bit-depth=%d", bit_depth);
+    if ((error_code = add_option(option_string, &encoder_options)) > 0) {
+        goto fail;
+    }
+
+    if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
+        int sar_num, sar_den;
+
+        av_reduce(&sar_num, &sar_den,
+            avctx->sample_aspect_ratio.num,
+            avctx->sample_aspect_ratio.den, 65535);
+        snprintf(option_string, MAX_OPTION_LENGTH, "--sar=%d:%d", sar_num, sar_den);
+        if ((error_code = add_option(option_string, &encoder_options)) > 0) {
+            goto fail;
+        }
+    }
+
+    // Parse additional command line options
+    if (ctx->options) {
+        AVDictionary *dict = NULL;
+        AVDictionaryEntry *en = NULL;
+
+        if (!av_dict_parse_string(&dict, ctx->options, "=", ":", 0)) {
+            while ((en = av_dict_get(dict, "", en, AV_DICT_IGNORE_SUFFIX))) {
+                int const illegal_option =
+                    !strcmp("input-res", en->key) ||
+                    !strcmp("frame-rate", en->key) ||
+                    !strcmp("f", en->key) ||
+                    !strcmp("frames", en->key) ||
+                    !strcmp("sar", en->key) ||
+                    !strcmp("bit-depth", en->key) ||
+                    !strcmp("internal-bit-depth", en->key);
+                if (illegal_option) {
+                    av_log(avctx, AV_LOG_WARNING, "%s=%s ignored - this parameter is inferred from ffmpeg.\n", en->key, en->value);
+                } else {
+                    if (turing_check_binary_option(en->key)) {
+                        snprintf(option_string, MAX_OPTION_LENGTH, "--%s", en->key);
+                    } else {
+                        snprintf(option_string, MAX_OPTION_LENGTH, "--%s=%s", en->key, en->value);
+                    }
+                    if ((error_code = add_option(option_string, &encoder_options)) > 0) {
+                        goto fail;
+                    }
+                }
+            }
+            av_dict_free(&dict);
+        }
+    }
+
+    if ((error_code = add_option("dummy-input-filename", &encoder_options)) > 0) {
+        goto fail;
+    }
+
+    if ((error_code = finalise_options(&encoder_options)) > 0) {
+        goto fail;
+    }
+
+    settings.argv = (char const**)encoder_options.argv;
+    settings.argc = encoder_options.options_added;
+
+    for (int i=0; i<settings.argc; ++i) {
+        av_log(avctx, AV_LOG_VERBOSE, "arg %d: %s\n", i, settings.argv[i]);
+    }
+
+    ctx->encoder = turing_create_encoder(settings);
+
+    if (!ctx->encoder) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to create libturing encoder.\n");
+        error_code = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
+        turing_bitstream const *bitstream;
+        bitstream = turing_encode_headers(ctx->encoder);
+        if (bitstream->size <= 0) {
+            av_log(avctx, AV_LOG_ERROR, "Failed to encode headers.\n");
+            turing_destroy_encoder(ctx->encoder);
+            error_code = AVERROR_INVALIDDATA;
+            goto fail;
+        }
+
+        avctx->extradata_size = bitstream->size;
+
+        avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
+        if (!avctx->extradata) {
+            av_log(avctx, AV_LOG_ERROR, "Failed to allocate HEVC extradata %d bytes\n", avctx->extradata_size);
+            turing_destroy_encoder(ctx->encoder);
+            error_code =  AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        memcpy(avctx->extradata, bitstream->p, bitstream->size);
+    }
+
+    av_freep(&encoder_options.argv);
+    av_freep(&encoder_options.options);
+    return 0;
+
+fail:
+    av_log(avctx, AV_LOG_ERROR, "Error while initialising the Turing codec.\n");
+    av_freep(&encoder_options.argv);
+    av_freep(&encoder_options.options);
+    return error_code;
+}
+
+static int libturing_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pic, int *got_packet)
+{
+    libturingEncodeContext *ctx = avctx->priv_data;
+    turing_encoder_output const *output;
+    int ret = 0;
+
+    if (pic) {
+        turing_picture picture;
+
+        picture.image[0].p = pic->data[0];
+        picture.image[1].p = pic->data[1];
+        picture.image[2].p = pic->data[2];
+        picture.image[0].stride = pic->linesize[0];
+        picture.image[1].stride = pic->linesize[1];
+        picture.image[2].stride = pic->linesize[2];
+        picture.pts = pic->pts;
+        output = turing_encode_picture(ctx->encoder, &picture);
+    } else {
+        output = turing_encode_picture(ctx->encoder, 0);
+    }
+
+    if (output->bitstream.size < 0) {
+        return AVERROR_EXTERNAL;
+    }
+
+    if (output->bitstream.size ==0) {
+        return 0;
+    }
+
+    ret = ff_alloc_packet2(avctx, pkt, output->bitstream.size, 0);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
+        return ret;
+    }
+
+    memcpy(pkt->data, output->bitstream.p, output->bitstream.size);
+
+    pkt->pts = output->pts;
+    pkt->dts = output->dts;
+    if (output->keyframe) {
+        pkt->flags |= AV_PKT_FLAG_KEY;
+    }
+
+    *got_packet = 1;
+    return 0;
+}
+
+static const AVOption options[] = {
+    { "turing-params", "configure additional turing encoder parameters", offsetof(libturingEncodeContext, options), AV_OPT_TYPE_STRING,{ 0 }, 0, 0, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
+    { NULL }
+};
+
+static const AVClass class = {
+    .class_name = "libturing",
+    .item_name = av_default_item_name,
+    .option = options,
+    .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_libturing_encoder = {
+    .name = "libturing",
+    .long_name = NULL_IF_CONFIG_SMALL("libturing HEVC"),
+    .type = AVMEDIA_TYPE_VIDEO,
+    .id = AV_CODEC_ID_HEVC,
+    .init = libturing_encode_init,
+    .encode2 = libturing_encode_frame,
+    .close = libturing_encode_close,
+    .priv_data_size = sizeof(libturingEncodeContext),
+    .priv_class = &class,
+    .capabilities = AV_CODEC_CAP_DELAY,
+    .pix_fmts = (const enum AVPixelFormat[]){AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE},
+};