libavcodec/mediacodecdec_h264.c - third_party/ffmpeg - Git at Google

 /*
  * Android MediaCodec H.264 decoder
  *
  * Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.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 <stdint.h>
 #include <string.h>

 #include "libavutil/avassert.h"
 #include "libavutil/common.h"
 #include "libavutil/fifo.h"
 #include "libavutil/opt.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/pixfmt.h"
 #include "libavutil/atomic.h"

 #include "avcodec.h"
 #include "h264.h"
 #include "internal.h"
 #include "mediacodecdec.h"
 #include "mediacodec_wrapper.h"

 #define CODEC_MIME "video/avc"

 typedef struct MediaCodecH264DecContext {

     MediaCodecDecContext ctx;

     AVBSFContext *bsf;

     AVFifoBuffer *fifo;

     AVPacket filtered_pkt;

 } MediaCodecH264DecContext;

 static av_cold int mediacodec_decode_close(AVCodecContext *avctx)
 {
     MediaCodecH264DecContext *s = avctx->priv_data;

     ff_mediacodec_dec_close(avctx, &s->ctx);

     av_fifo_free(s->fifo);

     av_bsf_free(&s->bsf);
     av_packet_unref(&s->filtered_pkt);

     return 0;
 }

 static int h264_ps_to_nalu(const uint8_t *src, int src_size, uint8_t **out, int *out_size)
 {
     int i;
     int ret = 0;
     uint8_t *p = NULL;
     static const uint8_t nalu_header[] = { 0x00, 0x00, 0x00, 0x01 };

     if (!out || !out_size) {
         return AVERROR(EINVAL);
     }

     p = av_malloc(sizeof(nalu_header) + src_size);
     if (!p) {
         return AVERROR(ENOMEM);
     }

     *out = p;
     *out_size = sizeof(nalu_header) + src_size;

     memcpy(p, nalu_header, sizeof(nalu_header));
     memcpy(p + sizeof(nalu_header), src, src_size);

     /* Escape 0x00, 0x00, 0x0{0-3} pattern */
     for (i = 4; i < *out_size; i++) {
         if (i < *out_size - 3 &&
             p[i + 0] == 0 &&
             p[i + 1] == 0 &&
             p[i + 2] <= 3) {
             uint8_t *new;

             *out_size += 1;
             new = av_realloc(*out, *out_size);
             if (!new) {
                 ret = AVERROR(ENOMEM);
                 goto done;
             }
             *out = p = new;

             i = i + 2;
             memmove(p + i + 1, p + i, *out_size - (i + 1));
             p[i] = 0x03;
         }
     }
 done:
     if (ret < 0) {
         av_freep(out);
         *out_size = 0;
     }

     return ret;
 }

 static av_cold int mediacodec_decode_init(AVCodecContext *avctx)
 {
     int i;
     int ret;

     H264ParamSets ps;
     const PPS *pps = NULL;
     const SPS *sps = NULL;
     int is_avc = 0;
     int nal_length_size = 0;

     FFAMediaFormat *format = NULL;
     MediaCodecH264DecContext *s = avctx->priv_data;

     memset(&ps, 0, sizeof(ps));

     format = ff_AMediaFormat_new();
     if (!format) {
         av_log(avctx, AV_LOG_ERROR, "Failed to create media format\n");
         ret = AVERROR_EXTERNAL;
         goto done;
     }

     ff_AMediaFormat_setString(format, "mime", CODEC_MIME);
     ff_AMediaFormat_setInt32(format, "width", avctx->width);
     ff_AMediaFormat_setInt32(format, "height", avctx->height);

     ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
                                    &ps, &is_avc, &nal_length_size, 0, avctx);
     if (ret < 0) {
         goto done;
     }

     for (i = 0; i < MAX_PPS_COUNT; i++) {
         if (ps.pps_list[i]) {
             pps = (const PPS*)ps.pps_list[i]->data;
             break;
         }
     }

     if (pps) {
         if (ps.sps_list[pps->sps_id]) {
             sps = (const SPS*)ps.sps_list[pps->sps_id]->data;
         }
     }

     if (pps && sps) {
         uint8_t *data = NULL;
         size_t data_size = 0;

         if ((ret = h264_ps_to_nalu(sps->data, sps->data_size, &data, &data_size)) < 0) {
             goto done;
         }
         ff_AMediaFormat_setBuffer(format, "csd-0", (void*)data, data_size);
         av_freep(&data);

         if ((ret = h264_ps_to_nalu(pps->data, pps->data_size, &data, &data_size)) < 0) {
             goto done;
         }
         ff_AMediaFormat_setBuffer(format, "csd-1", (void*)data, data_size);
         av_freep(&data);
     } else {
         av_log(avctx, AV_LOG_ERROR, "Could not extract PPS/SPS from extradata");
         ret = AVERROR_INVALIDDATA;
         goto done;
     }

     if ((ret = ff_mediacodec_dec_init(avctx, &s->ctx, CODEC_MIME, format)) < 0) {
         goto done;
     }

     av_log(avctx, AV_LOG_INFO, "MediaCodec started successfully, ret = %d\n", ret);

     s->fifo = av_fifo_alloc(sizeof(AVPacket));
     if (!s->fifo) {
         ret = AVERROR(ENOMEM);
         goto done;
     }

     const AVBitStreamFilter *bsf = av_bsf_get_by_name("h264_mp4toannexb");
     if(!bsf) {
         ret = AVERROR_BSF_NOT_FOUND;
         goto done;
     }

     if ((ret = av_bsf_alloc(bsf, &s->bsf))) {
         goto done;
     }

     if (((ret = avcodec_parameters_from_context(s->bsf->par_in, avctx)) < 0) ||
         ((ret = av_bsf_init(s->bsf)) < 0)) {
           goto done;
     }

     av_init_packet(&s->filtered_pkt);

 done:
     if (format) {
         ff_AMediaFormat_delete(format);
     }

     if (ret < 0) {
         mediacodec_decode_close(avctx);
     }

     ff_h264_ps_uninit(&ps);

     return ret;
 }


 static int mediacodec_process_data(AVCodecContext *avctx, AVFrame *frame,
                                    int *got_frame, AVPacket *pkt)
 {
     MediaCodecH264DecContext *s = avctx->priv_data;

     return ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, pkt);
 }

 static int mediacodec_decode_frame(AVCodecContext *avctx, void *data,
                                    int *got_frame, AVPacket *avpkt)
 {
     MediaCodecH264DecContext *s = avctx->priv_data;
     AVFrame *frame    = data;
     int ret;

     /* buffer the input packet */
     if (avpkt->size) {
         AVPacket input_pkt = { 0 };

         if (av_fifo_space(s->fifo) < sizeof(input_pkt)) {
             ret = av_fifo_realloc2(s->fifo,
                                    av_fifo_size(s->fifo) + sizeof(input_pkt));
             if (ret < 0)
                 return ret;
         }

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

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

             av_packet_unref(&s->filtered_pkt);

             /* no more data */
             if (av_fifo_size(s->fifo) < sizeof(AVPacket)) {
                 return avpkt->size ? avpkt->size :
                     ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, avpkt);
             }

             av_fifo_generic_read(s->fifo, &input_pkt, sizeof(input_pkt), NULL);

             ret = av_bsf_send_packet(s->bsf, &input_pkt);
             if (ret < 0) {
                 return ret;
             }

             ret = av_bsf_receive_packet(s->bsf, &s->filtered_pkt);
             if (ret == AVERROR(EAGAIN)) {
                 goto done;
             }

             /* h264_mp4toannexb is used here and does not requires flushing */
             av_assert0(ret != AVERROR_EOF);

             if (ret < 0) {
                 return ret;
             }
         }

         ret = mediacodec_process_data(avctx, frame, got_frame, &s->filtered_pkt);
         if (ret < 0)
             return ret;

         s->filtered_pkt.size -= ret;
         s->filtered_pkt.data += ret;
     }
 done:
     return avpkt->size;
 }

 static void mediacodec_decode_flush(AVCodecContext *avctx)
 {
     MediaCodecH264DecContext *s = avctx->priv_data;

     while (av_fifo_size(s->fifo)) {
         AVPacket pkt;
         av_fifo_generic_read(s->fifo, &pkt, sizeof(pkt), NULL);
         av_packet_unref(&pkt);
     }
     av_fifo_reset(s->fifo);

     av_packet_unref(&s->filtered_pkt);

     ff_mediacodec_dec_flush(avctx, &s->ctx);
 }

 AVCodec ff_h264_mediacodec_decoder = {
     .name           = "h264_mediacodec",
     .long_name      = NULL_IF_CONFIG_SMALL("H.264 Android MediaCodec decoder"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_H264,
     .priv_data_size = sizeof(MediaCodecH264DecContext),
     .init           = mediacodec_decode_init,
     .decode         = mediacodec_decode_frame,
     .flush          = mediacodec_decode_flush,
     .close          = mediacodec_decode_close,
     .capabilities   = CODEC_CAP_DELAY,
     .caps_internal  = FF_CODEC_CAP_SETS_PKT_DTS,
 };
	/*
	* Android MediaCodec H.264 decoder
	*
	* Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.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 <stdint.h>
	#include <string.h>

	#include "libavutil/avassert.h"
	#include "libavutil/common.h"
	#include "libavutil/fifo.h"
	#include "libavutil/opt.h"
	#include "libavutil/intreadwrite.h"
	#include "libavutil/pixfmt.h"
	#include "libavutil/atomic.h"

	#include "avcodec.h"
	#include "h264.h"
	#include "internal.h"
	#include "mediacodecdec.h"
	#include "mediacodec_wrapper.h"

	#define CODEC_MIME "video/avc"

	typedef struct MediaCodecH264DecContext {

	MediaCodecDecContext ctx;

	AVBSFContext *bsf;

	AVFifoBuffer *fifo;

	AVPacket filtered_pkt;

	} MediaCodecH264DecContext;

	static av_cold int mediacodec_decode_close(AVCodecContext *avctx)
	{
	MediaCodecH264DecContext *s = avctx->priv_data;

	ff_mediacodec_dec_close(avctx, &s->ctx);

	av_fifo_free(s->fifo);

	av_bsf_free(&s->bsf);
	av_packet_unref(&s->filtered_pkt);

	return 0;
	}

	static int h264_ps_to_nalu(const uint8_t src, int src_size, uint8_t out, int out_size)
	{
	int i;
	int ret = 0;
	uint8_t *p = NULL;
	static const uint8_t nalu_header[] = { 0x00, 0x00, 0x00, 0x01 };

	if (!out \|\| !out_size) {
	return AVERROR(EINVAL);
	}

	p = av_malloc(sizeof(nalu_header) + src_size);
	if (!p) {
	return AVERROR(ENOMEM);
	}

	*out = p;
	*out_size = sizeof(nalu_header) + src_size;

	memcpy(p, nalu_header, sizeof(nalu_header));
	memcpy(p + sizeof(nalu_header), src, src_size);

	/* Escape 0x00, 0x00, 0x0{0-3} pattern */
	for (i = 4; i < *out_size; i++) {
	if (i < *out_size - 3 &&
	p[i + 0] == 0 &&
	p[i + 1] == 0 &&
	p[i + 2] <= 3) {
	uint8_t *new;

	*out_size += 1;
	new = av_realloc(out, out_size);
	if (!new) {
	ret = AVERROR(ENOMEM);
	goto done;
	}
	*out = p = new;

	i = i + 2;
	memmove(p + i + 1, p + i, *out_size - (i + 1));
	p[i] = 0x03;
	}
	}
	done:
	if (ret < 0) {
	av_freep(out);
	*out_size = 0;
	}

	return ret;
	}

	static av_cold int mediacodec_decode_init(AVCodecContext *avctx)
	{
	int i;
	int ret;

	H264ParamSets ps;
	const PPS *pps = NULL;
	const SPS *sps = NULL;
	int is_avc = 0;
	int nal_length_size = 0;

	FFAMediaFormat *format = NULL;
	MediaCodecH264DecContext *s = avctx->priv_data;

	memset(&ps, 0, sizeof(ps));

	format = ff_AMediaFormat_new();
	if (!format) {
	av_log(avctx, AV_LOG_ERROR, "Failed to create media format\n");
	ret = AVERROR_EXTERNAL;
	goto done;
	}

	ff_AMediaFormat_setString(format, "mime", CODEC_MIME);
	ff_AMediaFormat_setInt32(format, "width", avctx->width);
	ff_AMediaFormat_setInt32(format, "height", avctx->height);

	ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
	&ps, &is_avc, &nal_length_size, 0, avctx);
	if (ret < 0) {
	goto done;
	}

	for (i = 0; i < MAX_PPS_COUNT; i++) {
	if (ps.pps_list[i]) {
	pps = (const PPS*)ps.pps_list[i]->data;
	break;
	}
	}

	if (pps) {
	if (ps.sps_list[pps->sps_id]) {
	sps = (const SPS*)ps.sps_list[pps->sps_id]->data;
	}
	}

	if (pps && sps) {
	uint8_t *data = NULL;
	size_t data_size = 0;

	if ((ret = h264_ps_to_nalu(sps->data, sps->data_size, &data, &data_size)) < 0) {
	goto done;
	}
	ff_AMediaFormat_setBuffer(format, "csd-0", (void*)data, data_size);
	av_freep(&data);

	if ((ret = h264_ps_to_nalu(pps->data, pps->data_size, &data, &data_size)) < 0) {
	goto done;
	}
	ff_AMediaFormat_setBuffer(format, "csd-1", (void*)data, data_size);
	av_freep(&data);
	} else {
	av_log(avctx, AV_LOG_ERROR, "Could not extract PPS/SPS from extradata");
	ret = AVERROR_INVALIDDATA;
	goto done;
	}

	if ((ret = ff_mediacodec_dec_init(avctx, &s->ctx, CODEC_MIME, format)) < 0) {
	goto done;
	}

	av_log(avctx, AV_LOG_INFO, "MediaCodec started successfully, ret = %d\n", ret);

	s->fifo = av_fifo_alloc(sizeof(AVPacket));
	if (!s->fifo) {
	ret = AVERROR(ENOMEM);
	goto done;
	}

	const AVBitStreamFilter *bsf = av_bsf_get_by_name("h264_mp4toannexb");
	if(!bsf) {
	ret = AVERROR_BSF_NOT_FOUND;
	goto done;
	}

	if ((ret = av_bsf_alloc(bsf, &s->bsf))) {
	goto done;
	}

	if (((ret = avcodec_parameters_from_context(s->bsf->par_in, avctx)) < 0) \|\|
	((ret = av_bsf_init(s->bsf)) < 0)) {
	goto done;
	}

	av_init_packet(&s->filtered_pkt);

	done:
	if (format) {
	ff_AMediaFormat_delete(format);
	}

	if (ret < 0) {
	mediacodec_decode_close(avctx);
	}

	ff_h264_ps_uninit(&ps);

	return ret;
	}


	static int mediacodec_process_data(AVCodecContext avctx, AVFrame frame,
	int got_frame, AVPacket pkt)
	{
	MediaCodecH264DecContext *s = avctx->priv_data;

	return ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, pkt);
	}

	static int mediacodec_decode_frame(AVCodecContext avctx, void data,
	int got_frame, AVPacket avpkt)
	{
	MediaCodecH264DecContext *s = avctx->priv_data;
	AVFrame *frame = data;
	int ret;

	/* buffer the input packet */
	if (avpkt->size) {
	AVPacket input_pkt = { 0 };

	if (av_fifo_space(s->fifo) < sizeof(input_pkt)) {
	ret = av_fifo_realloc2(s->fifo,
	av_fifo_size(s->fifo) + sizeof(input_pkt));
	if (ret < 0)
	return ret;
	}

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

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

	av_packet_unref(&s->filtered_pkt);

	/* no more data */
	if (av_fifo_size(s->fifo) < sizeof(AVPacket)) {
	return avpkt->size ? avpkt->size :
	ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, avpkt);
	}

	av_fifo_generic_read(s->fifo, &input_pkt, sizeof(input_pkt), NULL);

	ret = av_bsf_send_packet(s->bsf, &input_pkt);
	if (ret < 0) {
	return ret;
	}

	ret = av_bsf_receive_packet(s->bsf, &s->filtered_pkt);
	if (ret == AVERROR(EAGAIN)) {
	goto done;
	}

	/* h264_mp4toannexb is used here and does not requires flushing */
	av_assert0(ret != AVERROR_EOF);

	if (ret < 0) {
	return ret;
	}
	}

	ret = mediacodec_process_data(avctx, frame, got_frame, &s->filtered_pkt);
	if (ret < 0)
	return ret;

	s->filtered_pkt.size -= ret;
	s->filtered_pkt.data += ret;
	}
	done:
	return avpkt->size;
	}

	static void mediacodec_decode_flush(AVCodecContext *avctx)
	{
	MediaCodecH264DecContext *s = avctx->priv_data;

	while (av_fifo_size(s->fifo)) {
	AVPacket pkt;
	av_fifo_generic_read(s->fifo, &pkt, sizeof(pkt), NULL);
	av_packet_unref(&pkt);
	}
	av_fifo_reset(s->fifo);

	av_packet_unref(&s->filtered_pkt);

	ff_mediacodec_dec_flush(avctx, &s->ctx);
	}

	AVCodec ff_h264_mediacodec_decoder = {
	.name = "h264_mediacodec",
	.long_name = NULL_IF_CONFIG_SMALL("H.264 Android MediaCodec decoder"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_H264,
	.priv_data_size = sizeof(MediaCodecH264DecContext),
	.init = mediacodec_decode_init,
	.decode = mediacodec_decode_frame,
	.flush = mediacodec_decode_flush,
	.close = mediacodec_decode_close,
	.capabilities = CODEC_CAP_DELAY,
	.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS,
	};