libavcodec/libopenh264dec.c - third_party/ffmpeg - Git at Google

 /*
  * OpenH264 video decoder
  * Copyright (C) 2016 Martin Storsjo
  *
  * 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 <wels/codec_api.h>
 #include <wels/codec_ver.h>

 #include "libavutil/common.h"
 #include "libavutil/fifo.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/opt.h"

 #include "avcodec.h"
 #include "internal.h"
 #include "libopenh264.h"

 typedef struct SVCContext {
     ISVCDecoder *decoder;
     AVBSFContext *bsf;
     AVFifoBuffer *packet_fifo;
     AVPacket pkt_filtered;
 } SVCContext;

 static av_cold int svc_decode_close(AVCodecContext *avctx)
 {
     SVCContext *s = avctx->priv_data;
     AVPacket pkt;

     if (s->decoder)
         WelsDestroyDecoder(s->decoder);

     while (s->packet_fifo && av_fifo_size(s->packet_fifo) >= sizeof(pkt)) {
         av_fifo_generic_read(s->packet_fifo, &pkt, sizeof(pkt), NULL);
         av_packet_unref(&pkt);
     }

     av_bsf_free(&s->bsf);
     av_packet_unref(&s->pkt_filtered);
     av_fifo_free(s->packet_fifo);

     return 0;
 }

 static av_cold int svc_decode_init(AVCodecContext *avctx)
 {
     SVCContext *s = avctx->priv_data;
     SDecodingParam param = { 0 };
     int err;
     int log_level;
     WelsTraceCallback callback_function;

     if ((err = ff_libopenh264_check_version(avctx)) < 0)
         return err;

     s->packet_fifo = av_fifo_alloc(sizeof(AVPacket));
     if (!s->packet_fifo) {
         err = AVERROR(ENOMEM);
         goto fail;
     }

     if (WelsCreateDecoder(&s->decoder)) {
         av_log(avctx, AV_LOG_ERROR, "Unable to create decoder\n");
         err = AVERROR_UNKNOWN;
         goto fail;
     }

     // Pass all libopenh264 messages to our callback, to allow ourselves to filter them.
     log_level = WELS_LOG_DETAIL;
     callback_function = ff_libopenh264_trace_callback;
     (*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_LEVEL, &log_level);
     (*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK, (void *)&callback_function);
     (*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK_CONTEXT, (void *)&avctx);

 #if !OPENH264_VER_AT_LEAST(1, 6)
     param.eOutputColorFormat = videoFormatI420;
 #endif
     param.eEcActiveIdc       = ERROR_CON_DISABLE;
     param.sVideoProperty.eVideoBsType = VIDEO_BITSTREAM_DEFAULT;

     if ((*s->decoder)->Initialize(s->decoder, &param) != cmResultSuccess) {
         av_log(avctx, AV_LOG_ERROR, "Initialize failed\n");
         err = AVERROR_UNKNOWN;
         goto fail;
     }

     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

 fail:
     return err;
 }

 static int init_bsf(AVCodecContext *avctx)
 {
     SVCContext *s = avctx->priv_data;
     const AVBitStreamFilter *filter;
     int ret;

     if (s->bsf)
         return 0;

     // If the input stream already is annex b, this BSF only passes the
     // packets through unchanged.
     filter = av_bsf_get_by_name("h264_mp4toannexb");
     if (!filter)
         return AVERROR_BUG;

     ret = av_bsf_alloc(filter, &s->bsf);
     if (ret < 0)
         return ret;

     ret = avcodec_parameters_from_context(s->bsf->par_in, avctx);
     if (ret < 0)
         return ret;

     s->bsf->time_base_in = avctx->time_base;

     ret = av_bsf_init(s->bsf);
     if (ret < 0)
         return ret;

     return ret;
 }

 static int svc_decode_frame(AVCodecContext *avctx, void *data,
                             int *got_frame, AVPacket *avpkt)
 {
     SVCContext *s = avctx->priv_data;
     SBufferInfo info = { 0 };
     uint8_t* ptrs[3];
     int linesize[3];
     AVFrame *avframe = data;
     int ret;
     DECODING_STATE state;

     if ((ret = init_bsf(avctx)) < 0)
         return ret;

     if (avpkt->size) {
         AVPacket input_ref = { 0 };
         if (av_fifo_space(s->packet_fifo) < sizeof(input_ref)) {
             ret = av_fifo_realloc2(s->packet_fifo,
                                    av_fifo_size(s->packet_fifo) + sizeof(input_ref));
             if (ret < 0)
                 return ret;
         }

         ret = av_packet_ref(&input_ref, avpkt);
         if (ret < 0)
             return ret;
         av_fifo_generic_write(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
     }

     while (!*got_frame) {
         /* prepare the input data -- convert to Annex B if needed */
         if (s->pkt_filtered.size <= 0) {
             AVPacket input_ref;

             /* no more data */
             if (av_fifo_size(s->packet_fifo) < sizeof(AVPacket))
                 return avpkt->size ? avpkt->size : 0;

             av_packet_unref(&s->pkt_filtered);

             av_fifo_generic_read(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
             ret = av_bsf_send_packet(s->bsf, &input_ref);
             if (ret < 0) {
                 av_packet_unref(&input_ref);
                 return ret;
             }

             ret = av_bsf_receive_packet(s->bsf, &s->pkt_filtered);
             if (ret < 0)
                 av_packet_move_ref(&s->pkt_filtered, &input_ref);
             else
                 av_packet_unref(&input_ref);
         }

         state = (*s->decoder)->DecodeFrame2(s->decoder, s->pkt_filtered.data, s->pkt_filtered.size, ptrs, &info);
         s->pkt_filtered.size = 0;
         if (state != dsErrorFree) {
             av_log(avctx, AV_LOG_ERROR, "DecodeFrame2 failed\n");
             return AVERROR_UNKNOWN;
         }
         if (info.iBufferStatus != 1) {
             av_log(avctx, AV_LOG_DEBUG, "No frame produced\n");
             continue;
         }

         ret = ff_set_dimensions(avctx, info.UsrData.sSystemBuffer.iWidth, info.UsrData.sSystemBuffer.iHeight);
         if (ret < 0)
             return ret;
         // The decoder doesn't (currently) support decoding into a user
         // provided buffer, so do a copy instead.
         if (ff_get_buffer(avctx, avframe, 0) < 0) {
             av_log(avctx, AV_LOG_ERROR, "Unable to allocate buffer\n");
             return AVERROR(ENOMEM);
         }

         linesize[0] = info.UsrData.sSystemBuffer.iStride[0];
         linesize[1] = linesize[2] = info.UsrData.sSystemBuffer.iStride[1];
         av_image_copy(avframe->data, avframe->linesize, (const uint8_t **) ptrs, linesize, avctx->pix_fmt, avctx->width, avctx->height);

         avframe->pts     = s->pkt_filtered.pts;
         avframe->pkt_dts = s->pkt_filtered.dts;
 #if FF_API_PKT_PTS
 FF_DISABLE_DEPRECATION_WARNINGS
         avframe->pkt_pts = s->pkt_filtered.pts;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

         *got_frame = 1;
     }
     return avpkt->size;
 }

 AVCodec ff_libopenh264_decoder = {
     .name           = "libopenh264",
     .long_name      = NULL_IF_CONFIG_SMALL("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_H264,
     .priv_data_size = sizeof(SVCContext),
     .init           = svc_decode_init,
     .decode         = svc_decode_frame,
     .close          = svc_decode_close,
     // The decoder doesn't currently support B-frames, and the decoder's API
     // doesn't support reordering/delay, but the BSF could incur delay.
     .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
     .caps_internal  = FF_CODEC_CAP_SETS_PKT_DTS | FF_CODEC_CAP_INIT_THREADSAFE |
                       FF_CODEC_CAP_INIT_CLEANUP,
 };
	/*
	* OpenH264 video decoder
	* Copyright (C) 2016 Martin Storsjo
	*
	* 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 <wels/codec_api.h>
	#include <wels/codec_ver.h>

	#include "libavutil/common.h"
	#include "libavutil/fifo.h"
	#include "libavutil/imgutils.h"
	#include "libavutil/intreadwrite.h"
	#include "libavutil/mathematics.h"
	#include "libavutil/opt.h"

	#include "avcodec.h"
	#include "internal.h"
	#include "libopenh264.h"

	typedef struct SVCContext {
	ISVCDecoder *decoder;
	AVBSFContext *bsf;
	AVFifoBuffer *packet_fifo;
	AVPacket pkt_filtered;
	} SVCContext;

	static av_cold int svc_decode_close(AVCodecContext *avctx)
	{
	SVCContext *s = avctx->priv_data;
	AVPacket pkt;

	if (s->decoder)
	WelsDestroyDecoder(s->decoder);

	while (s->packet_fifo && av_fifo_size(s->packet_fifo) >= sizeof(pkt)) {
	av_fifo_generic_read(s->packet_fifo, &pkt, sizeof(pkt), NULL);
	av_packet_unref(&pkt);
	}

	av_bsf_free(&s->bsf);
	av_packet_unref(&s->pkt_filtered);
	av_fifo_free(s->packet_fifo);

	return 0;
	}

	static av_cold int svc_decode_init(AVCodecContext *avctx)
	{
	SVCContext *s = avctx->priv_data;
	SDecodingParam param = { 0 };
	int err;
	int log_level;
	WelsTraceCallback callback_function;

	if ((err = ff_libopenh264_check_version(avctx)) < 0)
	return err;

	s->packet_fifo = av_fifo_alloc(sizeof(AVPacket));
	if (!s->packet_fifo) {
	err = AVERROR(ENOMEM);
	goto fail;
	}

	if (WelsCreateDecoder(&s->decoder)) {
	av_log(avctx, AV_LOG_ERROR, "Unable to create decoder\n");
	err = AVERROR_UNKNOWN;
	goto fail;
	}

	// Pass all libopenh264 messages to our callback, to allow ourselves to filter them.
	log_level = WELS_LOG_DETAIL;
	callback_function = ff_libopenh264_trace_callback;
	(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_LEVEL, &log_level);
	(s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK, (void )&callback_function);
	(s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK_CONTEXT, (void )&avctx);

	#if !OPENH264_VER_AT_LEAST(1, 6)
	param.eOutputColorFormat = videoFormatI420;
	#endif
	param.eEcActiveIdc = ERROR_CON_DISABLE;
	param.sVideoProperty.eVideoBsType = VIDEO_BITSTREAM_DEFAULT;

	if ((*s->decoder)->Initialize(s->decoder, &param) != cmResultSuccess) {
	av_log(avctx, AV_LOG_ERROR, "Initialize failed\n");
	err = AVERROR_UNKNOWN;
	goto fail;
	}

	avctx->pix_fmt = AV_PIX_FMT_YUV420P;

	fail:
	return err;
	}

	static int init_bsf(AVCodecContext *avctx)
	{
	SVCContext *s = avctx->priv_data;
	const AVBitStreamFilter *filter;
	int ret;

	if (s->bsf)
	return 0;

	// If the input stream already is annex b, this BSF only passes the
	// packets through unchanged.
	filter = av_bsf_get_by_name("h264_mp4toannexb");
	if (!filter)
	return AVERROR_BUG;

	ret = av_bsf_alloc(filter, &s->bsf);
	if (ret < 0)
	return ret;

	ret = avcodec_parameters_from_context(s->bsf->par_in, avctx);
	if (ret < 0)
	return ret;

	s->bsf->time_base_in = avctx->time_base;

	ret = av_bsf_init(s->bsf);
	if (ret < 0)
	return ret;

	return ret;
	}

	static int svc_decode_frame(AVCodecContext avctx, void data,
	int got_frame, AVPacket avpkt)
	{
	SVCContext *s = avctx->priv_data;
	SBufferInfo info = { 0 };
	uint8_t* ptrs[3];
	int linesize[3];
	AVFrame *avframe = data;
	int ret;
	DECODING_STATE state;

	if ((ret = init_bsf(avctx)) < 0)
	return ret;

	if (avpkt->size) {
	AVPacket input_ref = { 0 };
	if (av_fifo_space(s->packet_fifo) < sizeof(input_ref)) {
	ret = av_fifo_realloc2(s->packet_fifo,
	av_fifo_size(s->packet_fifo) + sizeof(input_ref));
	if (ret < 0)
	return ret;
	}

	ret = av_packet_ref(&input_ref, avpkt);
	if (ret < 0)
	return ret;
	av_fifo_generic_write(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
	}

	while (!*got_frame) {
	/* prepare the input data -- convert to Annex B if needed */
	if (s->pkt_filtered.size <= 0) {
	AVPacket input_ref;

	/* no more data */
	if (av_fifo_size(s->packet_fifo) < sizeof(AVPacket))
	return avpkt->size ? avpkt->size : 0;

	av_packet_unref(&s->pkt_filtered);

	av_fifo_generic_read(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
	ret = av_bsf_send_packet(s->bsf, &input_ref);
	if (ret < 0) {
	av_packet_unref(&input_ref);
	return ret;
	}

	ret = av_bsf_receive_packet(s->bsf, &s->pkt_filtered);
	if (ret < 0)
	av_packet_move_ref(&s->pkt_filtered, &input_ref);
	else
	av_packet_unref(&input_ref);
	}

	state = (*s->decoder)->DecodeFrame2(s->decoder, s->pkt_filtered.data, s->pkt_filtered.size, ptrs, &info);
	s->pkt_filtered.size = 0;
	if (state != dsErrorFree) {
	av_log(avctx, AV_LOG_ERROR, "DecodeFrame2 failed\n");
	return AVERROR_UNKNOWN;
	}
	if (info.iBufferStatus != 1) {
	av_log(avctx, AV_LOG_DEBUG, "No frame produced\n");
	continue;
	}

	ret = ff_set_dimensions(avctx, info.UsrData.sSystemBuffer.iWidth, info.UsrData.sSystemBuffer.iHeight);
	if (ret < 0)
	return ret;
	// The decoder doesn't (currently) support decoding into a user
	// provided buffer, so do a copy instead.
	if (ff_get_buffer(avctx, avframe, 0) < 0) {
	av_log(avctx, AV_LOG_ERROR, "Unable to allocate buffer\n");
	return AVERROR(ENOMEM);
	}

	linesize[0] = info.UsrData.sSystemBuffer.iStride[0];
	linesize[1] = linesize[2] = info.UsrData.sSystemBuffer.iStride[1];
	av_image_copy(avframe->data, avframe->linesize, (const uint8_t **) ptrs, linesize, avctx->pix_fmt, avctx->width, avctx->height);

	avframe->pts = s->pkt_filtered.pts;
	avframe->pkt_dts = s->pkt_filtered.dts;
	#if FF_API_PKT_PTS
	FF_DISABLE_DEPRECATION_WARNINGS
	avframe->pkt_pts = s->pkt_filtered.pts;
	FF_ENABLE_DEPRECATION_WARNINGS
	#endif

	*got_frame = 1;
	}
	return avpkt->size;
	}

	AVCodec ff_libopenh264_decoder = {
	.name = "libopenh264",
	.long_name = NULL_IF_CONFIG_SMALL("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_H264,
	.priv_data_size = sizeof(SVCContext),
	.init = svc_decode_init,
	.decode = svc_decode_frame,
	.close = svc_decode_close,
	// The decoder doesn't currently support B-frames, and the decoder's API
	// doesn't support reordering/delay, but the BSF could incur delay.
	.capabilities = AV_CODEC_CAP_DELAY \| AV_CODEC_CAP_DR1,
	.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS \| FF_CODEC_CAP_INIT_THREADSAFE \|
	FF_CODEC_CAP_INIT_CLEANUP,
	};