libavcodec/libtheoraenc.c - nest-android-app/ffmpeg - Git at Google

 /*
  * Copyright (c) 2006 Paul Richards <paul.richards@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
  */

 /**
  * @file
  * @brief Theora encoder using libtheora.
  * @author Paul Richards <paul.richards@gmail.com>
  *
  * A lot of this is copy / paste from other output codecs in
  * libavcodec or pure guesswork (or both).
  *
  * I have used t_ prefixes on variables which are libtheora types
  * and o_ prefixes on variables which are libogg types.
  */

 /* FFmpeg includes */
 #include "libavutil/common.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/log.h"
 #include "libavutil/base64.h"
 #include "avcodec.h"
 #include "internal.h"

 /* libtheora includes */
 #include <theora/theoraenc.h>

 typedef struct TheoraContext {
     th_enc_ctx *t_state;
     uint8_t    *stats;
     int         stats_size;
     int         stats_offset;
     int         uv_hshift;
     int         uv_vshift;
     int         keyframe_mask;
 } TheoraContext;

 /** Concatenate an ogg_packet into the extradata. */
 static int concatenate_packet(unsigned int* offset,
                               AVCodecContext* avc_context,
                               const ogg_packet* packet)
 {
     const char* message = NULL;
     int newsize = avc_context->extradata_size + 2 + packet->bytes;
     int err = AVERROR_INVALIDDATA;

     if (packet->bytes < 0) {
         message = "ogg_packet has negative size";
     } else if (packet->bytes > 0xffff) {
         message = "ogg_packet is larger than 65535 bytes";
     } else if (newsize < avc_context->extradata_size) {
         message = "extradata_size would overflow";
     } else {
         if ((err = av_reallocp(&avc_context->extradata, newsize)) < 0) {
             avc_context->extradata_size = 0;
             message = "av_realloc failed";
         }
     }
     if (message) {
         av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message);
         return err;
     }

     avc_context->extradata_size = newsize;
     AV_WB16(avc_context->extradata + (*offset), packet->bytes);
     *offset += 2;
     memcpy(avc_context->extradata + (*offset), packet->packet, packet->bytes);
     (*offset) += packet->bytes;
     return 0;
 }

 static int get_stats(AVCodecContext *avctx, int eos)
 {
 #ifdef TH_ENCCTL_2PASS_OUT
     TheoraContext *h = avctx->priv_data;
     uint8_t *buf;
     int bytes;

     bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_OUT, &buf, sizeof(buf));
     if (bytes < 0) {
         av_log(avctx, AV_LOG_ERROR, "Error getting first pass stats\n");
         return AVERROR_EXTERNAL;
     }
     if (!eos) {
         void *tmp = av_fast_realloc(h->stats, &h->stats_size,
                                    h->stats_offset + bytes);
         if (!tmp)
             return AVERROR(ENOMEM);
         h->stats = tmp;
         memcpy(h->stats + h->stats_offset, buf, bytes);
         h->stats_offset += bytes;
     } else {
         int b64_size = AV_BASE64_SIZE(h->stats_offset);
         // libtheora generates a summary header at the end
         memcpy(h->stats, buf, bytes);
         avctx->stats_out = av_malloc(b64_size);
         if (!avctx->stats_out)
             return AVERROR(ENOMEM);
         av_base64_encode(avctx->stats_out, b64_size, h->stats, h->stats_offset);
     }
     return 0;
 #else
     av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
     return AVERROR(ENOSUP);
 #endif
 }

 // libtheora won't read the entire buffer we give it at once, so we have to
 // repeatedly submit it...
 static int submit_stats(AVCodecContext *avctx)
 {
 #ifdef TH_ENCCTL_2PASS_IN
     TheoraContext *h = avctx->priv_data;
     int bytes;
     if (!h->stats) {
         if (!avctx->stats_in) {
             av_log(avctx, AV_LOG_ERROR, "No statsfile for second pass\n");
             return AVERROR(EINVAL);
         }
         h->stats_size = strlen(avctx->stats_in) * 3/4;
         h->stats      = av_malloc(h->stats_size);
         if (!h->stats) {
             h->stats_size = 0;
             return AVERROR(ENOMEM);
         }
         h->stats_size = av_base64_decode(h->stats, avctx->stats_in, h->stats_size);
     }
     while (h->stats_size - h->stats_offset > 0) {
         bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_IN,
                               h->stats + h->stats_offset,
                               h->stats_size - h->stats_offset);
         if (bytes < 0) {
             av_log(avctx, AV_LOG_ERROR, "Error submitting stats\n");
             return AVERROR_EXTERNAL;
         }
         if (!bytes)
             return 0;
         h->stats_offset += bytes;
     }
     return 0;
 #else
     av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
     return AVERROR(ENOSUP);
 #endif
 }

 static av_cold int encode_init(AVCodecContext* avc_context)
 {
     th_info t_info;
     th_comment t_comment;
     ogg_packet o_packet;
     unsigned int offset;
     TheoraContext *h = avc_context->priv_data;
     uint32_t gop_size = avc_context->gop_size;
     int ret;

     /* Set up the theora_info struct */
     th_info_init(&t_info);
     t_info.frame_width  = FFALIGN(avc_context->width,  16);
     t_info.frame_height = FFALIGN(avc_context->height, 16);
     t_info.pic_width    = avc_context->width;
     t_info.pic_height   = avc_context->height;
     t_info.pic_x        = 0;
     t_info.pic_y        = 0;
     /* Swap numerator and denominator as time_base in AVCodecContext gives the
      * time period between frames, but theora_info needs the framerate.  */
     t_info.fps_numerator   = avc_context->time_base.den;
     t_info.fps_denominator = avc_context->time_base.num;
     if (avc_context->sample_aspect_ratio.num) {
         t_info.aspect_numerator   = avc_context->sample_aspect_ratio.num;
         t_info.aspect_denominator = avc_context->sample_aspect_ratio.den;
     } else {
         t_info.aspect_numerator   = 1;
         t_info.aspect_denominator = 1;
     }

     if (avc_context->color_primaries == AVCOL_PRI_BT470M)
         t_info.colorspace = TH_CS_ITU_REC_470M;
     else if (avc_context->color_primaries == AVCOL_PRI_BT470BG)
         t_info.colorspace = TH_CS_ITU_REC_470BG;
     else
         t_info.colorspace = TH_CS_UNSPECIFIED;

     if (avc_context->pix_fmt == AV_PIX_FMT_YUV420P)
         t_info.pixel_fmt = TH_PF_420;
     else if (avc_context->pix_fmt == AV_PIX_FMT_YUV422P)
         t_info.pixel_fmt = TH_PF_422;
     else if (avc_context->pix_fmt == AV_PIX_FMT_YUV444P)
         t_info.pixel_fmt = TH_PF_444;
     else {
         av_log(avc_context, AV_LOG_ERROR, "Unsupported pix_fmt\n");
         return AVERROR(EINVAL);
     }
     avcodec_get_chroma_sub_sample(avc_context->pix_fmt, &h->uv_hshift, &h->uv_vshift);

     if (avc_context->flags & AV_CODEC_FLAG_QSCALE) {
         /* Clip global_quality in QP units to the [0 - 10] range
            to be consistent with the libvorbis implementation.
            Theora accepts a quality parameter which is an int value in
            the [0 - 63] range.
         */
         t_info.quality        = av_clipf(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
         t_info.target_bitrate = 0;
     } else {
         t_info.target_bitrate = avc_context->bit_rate;
         t_info.quality        = 0;
     }

     /* Now initialise libtheora */
     h->t_state = th_encode_alloc(&t_info);
     if (!h->t_state) {
         av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n");
         return AVERROR_EXTERNAL;
     }

     h->keyframe_mask = (1 << t_info.keyframe_granule_shift) - 1;
     /* Clear up theora_info struct */
     th_info_clear(&t_info);

     if (th_encode_ctl(h->t_state, TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE,
                       &gop_size, sizeof(gop_size))) {
         av_log(avc_context, AV_LOG_ERROR, "Error setting GOP size\n");
         return AVERROR_EXTERNAL;
     }

     // need to enable 2 pass (via TH_ENCCTL_2PASS_) before encoding headers
     if (avc_context->flags & AV_CODEC_FLAG_PASS1) {
         if ((ret = get_stats(avc_context, 0)) < 0)
             return ret;
     } else if (avc_context->flags & AV_CODEC_FLAG_PASS2) {
         if ((ret = submit_stats(avc_context)) < 0)
             return ret;
     }

     /*
         Output first header packet consisting of theora
         header, comment, and tables.

         Each one is prefixed with a 16bit size, then they
         are concatenated together into libavcodec's extradata.
     */
     offset = 0;

     /* Headers */
     th_comment_init(&t_comment);

     while (th_encode_flushheader(h->t_state, &t_comment, &o_packet))
         if ((ret = concatenate_packet(&offset, avc_context, &o_packet)) < 0)
             return ret;

     th_comment_clear(&t_comment);

     return 0;
 }

 static int encode_frame(AVCodecContext* avc_context, AVPacket *pkt,
                         const AVFrame *frame, int *got_packet)
 {
     th_ycbcr_buffer t_yuv_buffer;
     TheoraContext *h = avc_context->priv_data;
     ogg_packet o_packet;
     int result, i, ret;

     // EOS, finish and get 1st pass stats if applicable
     if (!frame) {
         th_encode_packetout(h->t_state, 1, &o_packet);
         if (avc_context->flags & AV_CODEC_FLAG_PASS1)
             if ((ret = get_stats(avc_context, 1)) < 0)
                 return ret;
         return 0;
     }

     /* Copy planes to the theora yuv_buffer */
     for (i = 0; i < 3; i++) {
         t_yuv_buffer[i].width  = FFALIGN(avc_context->width,  16) >> (i && h->uv_hshift);
         t_yuv_buffer[i].height = FFALIGN(avc_context->height, 16) >> (i && h->uv_vshift);
         t_yuv_buffer[i].stride = frame->linesize[i];
         t_yuv_buffer[i].data   = frame->data[i];
     }

     if (avc_context->flags & AV_CODEC_FLAG_PASS2)
         if ((ret = submit_stats(avc_context)) < 0)
             return ret;

     /* Now call into theora_encode_YUVin */
     result = th_encode_ycbcr_in(h->t_state, t_yuv_buffer);
     if (result) {
         const char* message;
         switch (result) {
         case -1:
             message = "differing frame sizes";
             break;
         case TH_EINVAL:
             message = "encoder is not ready or is finished";
             break;
         default:
             message = "unknown reason";
             break;
         }
         av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result);
         return AVERROR_EXTERNAL;
     }

     if (avc_context->flags & AV_CODEC_FLAG_PASS1)
         if ((ret = get_stats(avc_context, 0)) < 0)
             return ret;

     /* Pick up returned ogg_packet */
     result = th_encode_packetout(h->t_state, 0, &o_packet);
     switch (result) {
     case 0:
         /* No packet is ready */
         return 0;
     case 1:
         /* Success, we have a packet */
         break;
     default:
         av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result);
         return AVERROR_EXTERNAL;
     }

     /* Copy ogg_packet content out to buffer */
     if ((ret = ff_alloc_packet2(avc_context, pkt, o_packet.bytes, 0)) < 0)
         return ret;
     memcpy(pkt->data, o_packet.packet, o_packet.bytes);

     // HACK: assumes no encoder delay, this is true until libtheora becomes
     // multithreaded (which will be disabled unless explicitly requested)
     pkt->pts = pkt->dts = frame->pts;
 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS
     avc_context->coded_frame->key_frame = !(o_packet.granulepos & h->keyframe_mask);
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
     if (!(o_packet.granulepos & h->keyframe_mask))
         pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;

     return 0;
 }

 static av_cold int encode_close(AVCodecContext* avc_context)
 {
     TheoraContext *h = avc_context->priv_data;

     th_encode_free(h->t_state);
     av_freep(&h->stats);
     av_freep(&avc_context->stats_out);
     av_freep(&avc_context->extradata);
     avc_context->extradata_size = 0;

     return 0;
 }

 /** AVCodec struct exposed to libavcodec */
 AVCodec ff_libtheora_encoder = {
     .name           = "libtheora",
     .long_name      = NULL_IF_CONFIG_SMALL("libtheora Theora"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_THEORA,
     .priv_data_size = sizeof(TheoraContext),
     .init           = encode_init,
     .close          = encode_close,
     .encode2        = encode_frame,
     .capabilities   = AV_CODEC_CAP_DELAY, // needed to get the statsfile summary
     .pix_fmts       = (const enum AVPixelFormat[]){
         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE
     },
 };
	/*
	* Copyright (c) 2006 Paul Richards <paul.richards@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
	*/

	/**
	* @file
	* @brief Theora encoder using libtheora.
	* @author Paul Richards <paul.richards@gmail.com>
	*
	* A lot of this is copy / paste from other output codecs in
	* libavcodec or pure guesswork (or both).
	*
	* I have used t_ prefixes on variables which are libtheora types
	* and o_ prefixes on variables which are libogg types.
	*/

	/* FFmpeg includes */
	#include "libavutil/common.h"
	#include "libavutil/intreadwrite.h"
	#include "libavutil/pixdesc.h"
	#include "libavutil/log.h"
	#include "libavutil/base64.h"
	#include "avcodec.h"
	#include "internal.h"

	/* libtheora includes */
	#include <theora/theoraenc.h>

	typedef struct TheoraContext {
	th_enc_ctx *t_state;
	uint8_t *stats;
	int stats_size;
	int stats_offset;
	int uv_hshift;
	int uv_vshift;
	int keyframe_mask;
	} TheoraContext;

	/** Concatenate an ogg_packet into the extradata. */
	static int concatenate_packet(unsigned int* offset,
	AVCodecContext* avc_context,
	const ogg_packet* packet)
	{
	const char* message = NULL;
	int newsize = avc_context->extradata_size + 2 + packet->bytes;
	int err = AVERROR_INVALIDDATA;

	if (packet->bytes < 0) {
	message = "ogg_packet has negative size";
	} else if (packet->bytes > 0xffff) {
	message = "ogg_packet is larger than 65535 bytes";
	} else if (newsize < avc_context->extradata_size) {
	message = "extradata_size would overflow";
	} else {
	if ((err = av_reallocp(&avc_context->extradata, newsize)) < 0) {
	avc_context->extradata_size = 0;
	message = "av_realloc failed";
	}
	}
	if (message) {
	av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message);
	return err;
	}

	avc_context->extradata_size = newsize;
	AV_WB16(avc_context->extradata + (*offset), packet->bytes);
	*offset += 2;
	memcpy(avc_context->extradata + (*offset), packet->packet, packet->bytes);
	(*offset) += packet->bytes;
	return 0;
	}

	static int get_stats(AVCodecContext *avctx, int eos)
	{
	#ifdef TH_ENCCTL_2PASS_OUT
	TheoraContext *h = avctx->priv_data;
	uint8_t *buf;
	int bytes;

	bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_OUT, &buf, sizeof(buf));
	if (bytes < 0) {
	av_log(avctx, AV_LOG_ERROR, "Error getting first pass stats\n");
	return AVERROR_EXTERNAL;
	}
	if (!eos) {
	void *tmp = av_fast_realloc(h->stats, &h->stats_size,
	h->stats_offset + bytes);
	if (!tmp)
	return AVERROR(ENOMEM);
	h->stats = tmp;
	memcpy(h->stats + h->stats_offset, buf, bytes);
	h->stats_offset += bytes;
	} else {
	int b64_size = AV_BASE64_SIZE(h->stats_offset);
	// libtheora generates a summary header at the end
	memcpy(h->stats, buf, bytes);
	avctx->stats_out = av_malloc(b64_size);
	if (!avctx->stats_out)
	return AVERROR(ENOMEM);
	av_base64_encode(avctx->stats_out, b64_size, h->stats, h->stats_offset);
	}
	return 0;
	#else
	av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
	return AVERROR(ENOSUP);
	#endif
	}

	// libtheora won't read the entire buffer we give it at once, so we have to
	// repeatedly submit it...
	static int submit_stats(AVCodecContext *avctx)
	{
	#ifdef TH_ENCCTL_2PASS_IN
	TheoraContext *h = avctx->priv_data;
	int bytes;
	if (!h->stats) {
	if (!avctx->stats_in) {
	av_log(avctx, AV_LOG_ERROR, "No statsfile for second pass\n");
	return AVERROR(EINVAL);
	}
	h->stats_size = strlen(avctx->stats_in) * 3/4;
	h->stats = av_malloc(h->stats_size);
	if (!h->stats) {
	h->stats_size = 0;
	return AVERROR(ENOMEM);
	}
	h->stats_size = av_base64_decode(h->stats, avctx->stats_in, h->stats_size);
	}
	while (h->stats_size - h->stats_offset > 0) {
	bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_IN,
	h->stats + h->stats_offset,
	h->stats_size - h->stats_offset);
	if (bytes < 0) {
	av_log(avctx, AV_LOG_ERROR, "Error submitting stats\n");
	return AVERROR_EXTERNAL;
	}
	if (!bytes)
	return 0;
	h->stats_offset += bytes;
	}
	return 0;
	#else
	av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
	return AVERROR(ENOSUP);
	#endif
	}

	static av_cold int encode_init(AVCodecContext* avc_context)
	{
	th_info t_info;
	th_comment t_comment;
	ogg_packet o_packet;
	unsigned int offset;
	TheoraContext *h = avc_context->priv_data;
	uint32_t gop_size = avc_context->gop_size;
	int ret;

	/* Set up the theora_info struct */
	th_info_init(&t_info);
	t_info.frame_width = FFALIGN(avc_context->width, 16);
	t_info.frame_height = FFALIGN(avc_context->height, 16);
	t_info.pic_width = avc_context->width;
	t_info.pic_height = avc_context->height;
	t_info.pic_x = 0;
	t_info.pic_y = 0;
	/* Swap numerator and denominator as time_base in AVCodecContext gives the
	* time period between frames, but theora_info needs the framerate. */
	t_info.fps_numerator = avc_context->time_base.den;
	t_info.fps_denominator = avc_context->time_base.num;
	if (avc_context->sample_aspect_ratio.num) {
	t_info.aspect_numerator = avc_context->sample_aspect_ratio.num;
	t_info.aspect_denominator = avc_context->sample_aspect_ratio.den;
	} else {
	t_info.aspect_numerator = 1;
	t_info.aspect_denominator = 1;
	}

	if (avc_context->color_primaries == AVCOL_PRI_BT470M)
	t_info.colorspace = TH_CS_ITU_REC_470M;
	else if (avc_context->color_primaries == AVCOL_PRI_BT470BG)
	t_info.colorspace = TH_CS_ITU_REC_470BG;
	else
	t_info.colorspace = TH_CS_UNSPECIFIED;

	if (avc_context->pix_fmt == AV_PIX_FMT_YUV420P)
	t_info.pixel_fmt = TH_PF_420;
	else if (avc_context->pix_fmt == AV_PIX_FMT_YUV422P)
	t_info.pixel_fmt = TH_PF_422;
	else if (avc_context->pix_fmt == AV_PIX_FMT_YUV444P)
	t_info.pixel_fmt = TH_PF_444;
	else {
	av_log(avc_context, AV_LOG_ERROR, "Unsupported pix_fmt\n");
	return AVERROR(EINVAL);
	}
	avcodec_get_chroma_sub_sample(avc_context->pix_fmt, &h->uv_hshift, &h->uv_vshift);

	if (avc_context->flags & AV_CODEC_FLAG_QSCALE) {
	/* Clip global_quality in QP units to the [0 - 10] range
	to be consistent with the libvorbis implementation.
	Theora accepts a quality parameter which is an int value in
	the [0 - 63] range.
	*/
	t_info.quality = av_clipf(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
	t_info.target_bitrate = 0;
	} else {
	t_info.target_bitrate = avc_context->bit_rate;
	t_info.quality = 0;
	}

	/* Now initialise libtheora */
	h->t_state = th_encode_alloc(&t_info);
	if (!h->t_state) {
	av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n");
	return AVERROR_EXTERNAL;
	}

	h->keyframe_mask = (1 << t_info.keyframe_granule_shift) - 1;
	/* Clear up theora_info struct */
	th_info_clear(&t_info);

	if (th_encode_ctl(h->t_state, TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE,
	&gop_size, sizeof(gop_size))) {
	av_log(avc_context, AV_LOG_ERROR, "Error setting GOP size\n");
	return AVERROR_EXTERNAL;
	}

	// need to enable 2 pass (via TH_ENCCTL_2PASS_) before encoding headers
	if (avc_context->flags & AV_CODEC_FLAG_PASS1) {
	if ((ret = get_stats(avc_context, 0)) < 0)
	return ret;
	} else if (avc_context->flags & AV_CODEC_FLAG_PASS2) {
	if ((ret = submit_stats(avc_context)) < 0)
	return ret;
	}

	/*
	Output first header packet consisting of theora
	header, comment, and tables.

	Each one is prefixed with a 16bit size, then they
	are concatenated together into libavcodec's extradata.
	*/
	offset = 0;

	/* Headers */
	th_comment_init(&t_comment);

	while (th_encode_flushheader(h->t_state, &t_comment, &o_packet))
	if ((ret = concatenate_packet(&offset, avc_context, &o_packet)) < 0)
	return ret;

	th_comment_clear(&t_comment);

	return 0;
	}

	static int encode_frame(AVCodecContext* avc_context, AVPacket *pkt,
	const AVFrame frame, int got_packet)
	{
	th_ycbcr_buffer t_yuv_buffer;
	TheoraContext *h = avc_context->priv_data;
	ogg_packet o_packet;
	int result, i, ret;

	// EOS, finish and get 1st pass stats if applicable
	if (!frame) {
	th_encode_packetout(h->t_state, 1, &o_packet);
	if (avc_context->flags & AV_CODEC_FLAG_PASS1)
	if ((ret = get_stats(avc_context, 1)) < 0)
	return ret;
	return 0;
	}

	/* Copy planes to the theora yuv_buffer */
	for (i = 0; i < 3; i++) {
	t_yuv_buffer[i].width = FFALIGN(avc_context->width, 16) >> (i && h->uv_hshift);
	t_yuv_buffer[i].height = FFALIGN(avc_context->height, 16) >> (i && h->uv_vshift);
	t_yuv_buffer[i].stride = frame->linesize[i];
	t_yuv_buffer[i].data = frame->data[i];
	}

	if (avc_context->flags & AV_CODEC_FLAG_PASS2)
	if ((ret = submit_stats(avc_context)) < 0)
	return ret;

	/* Now call into theora_encode_YUVin */
	result = th_encode_ycbcr_in(h->t_state, t_yuv_buffer);
	if (result) {
	const char* message;
	switch (result) {
	case -1:
	message = "differing frame sizes";
	break;
	case TH_EINVAL:
	message = "encoder is not ready or is finished";
	break;
	default:
	message = "unknown reason";
	break;
	}
	av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result);
	return AVERROR_EXTERNAL;
	}

	if (avc_context->flags & AV_CODEC_FLAG_PASS1)
	if ((ret = get_stats(avc_context, 0)) < 0)
	return ret;

	/* Pick up returned ogg_packet */
	result = th_encode_packetout(h->t_state, 0, &o_packet);
	switch (result) {
	case 0:
	/* No packet is ready */
	return 0;
	case 1:
	/* Success, we have a packet */
	break;
	default:
	av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result);
	return AVERROR_EXTERNAL;
	}

	/* Copy ogg_packet content out to buffer */
	if ((ret = ff_alloc_packet2(avc_context, pkt, o_packet.bytes, 0)) < 0)
	return ret;
	memcpy(pkt->data, o_packet.packet, o_packet.bytes);

	// HACK: assumes no encoder delay, this is true until libtheora becomes
	// multithreaded (which will be disabled unless explicitly requested)
	pkt->pts = pkt->dts = frame->pts;
	#if FF_API_CODED_FRAME
	FF_DISABLE_DEPRECATION_WARNINGS
	avc_context->coded_frame->key_frame = !(o_packet.granulepos & h->keyframe_mask);
	FF_ENABLE_DEPRECATION_WARNINGS
	#endif
	if (!(o_packet.granulepos & h->keyframe_mask))
	pkt->flags \|= AV_PKT_FLAG_KEY;
	*got_packet = 1;

	return 0;
	}

	static av_cold int encode_close(AVCodecContext* avc_context)
	{
	TheoraContext *h = avc_context->priv_data;

	th_encode_free(h->t_state);
	av_freep(&h->stats);
	av_freep(&avc_context->stats_out);
	av_freep(&avc_context->extradata);
	avc_context->extradata_size = 0;

	return 0;
	}

	/** AVCodec struct exposed to libavcodec */
	AVCodec ff_libtheora_encoder = {
	.name = "libtheora",
	.long_name = NULL_IF_CONFIG_SMALL("libtheora Theora"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_THEORA,
	.priv_data_size = sizeof(TheoraContext),
	.init = encode_init,
	.close = encode_close,
	.encode2 = encode_frame,
	.capabilities = AV_CODEC_CAP_DELAY, // needed to get the statsfile summary
	.pix_fmts = (const enum AVPixelFormat[]){
	AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE
	},
	};