2016-01-21 08:29:39 +00:00
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/*
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* Android MediaCodec H.264 decoder
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*
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* Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <string.h>
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2016-05-26 12:52:01 +00:00
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#include "libavutil/avassert.h"
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2016-01-21 08:29:39 +00:00
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#include "libavutil/common.h"
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#include "libavutil/fifo.h"
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#include "libavutil/opt.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixfmt.h"
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#include "libavutil/atomic.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "mediacodecdec.h"
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#include "mediacodec_wrapper.h"
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#define CODEC_MIME "video/avc"
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typedef struct MediaCodecH264DecContext {
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MediaCodecDecContext ctx;
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2016-05-26 12:52:01 +00:00
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AVBSFContext *bsf;
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2016-01-21 08:29:39 +00:00
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AVFifoBuffer *fifo;
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AVPacket filtered_pkt;
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} MediaCodecH264DecContext;
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static int h264_extradata_to_annexb_sps_pps(AVCodecContext *avctx,
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uint8_t **extradata_annexb, int *extradata_annexb_size,
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int *sps_offset, int *sps_size,
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int *pps_offset, int *pps_size)
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{
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uint16_t unit_size;
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uint64_t total_size = 0;
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uint8_t i, j, unit_nb;
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uint8_t sps_seen = 0;
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uint8_t pps_seen = 0;
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const uint8_t *extradata;
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static const uint8_t nalu_header[4] = { 0x00, 0x00, 0x00, 0x01 };
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if (avctx->extradata_size < 8) {
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av_log(avctx, AV_LOG_ERROR,
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"Too small extradata size, corrupted stream or invalid MP4/AVCC bitstream\n");
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return AVERROR(EINVAL);
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}
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*extradata_annexb = NULL;
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*extradata_annexb_size = 0;
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*sps_offset = *sps_size = 0;
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*pps_offset = *pps_size = 0;
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extradata = avctx->extradata + 4;
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/* skip length size */
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extradata++;
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for (j = 0; j < 2; j ++) {
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if (j == 0) {
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/* number of sps unit(s) */
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unit_nb = *extradata++ & 0x1f;
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} else {
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/* number of pps unit(s) */
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unit_nb = *extradata++;
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}
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for (i = 0; i < unit_nb; i++) {
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int err;
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unit_size = AV_RB16(extradata);
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total_size += unit_size + 4;
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if (total_size > INT_MAX) {
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av_log(avctx, AV_LOG_ERROR,
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"Too big extradata size, corrupted stream or invalid MP4/AVCC bitstream\n");
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av_freep(extradata_annexb);
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return AVERROR(EINVAL);
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}
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if (extradata + 2 + unit_size > avctx->extradata + avctx->extradata_size) {
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av_log(avctx, AV_LOG_ERROR, "Packet header is not contained in global extradata, "
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"corrupted stream or invalid MP4/AVCC bitstream\n");
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av_freep(extradata_annexb);
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return AVERROR(EINVAL);
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}
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if ((err = av_reallocp(extradata_annexb, total_size)) < 0) {
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return err;
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}
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memcpy(*extradata_annexb + total_size - unit_size - 4, nalu_header, 4);
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memcpy(*extradata_annexb + total_size - unit_size, extradata + 2, unit_size);
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extradata += 2 + unit_size;
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}
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if (unit_nb) {
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if (j == 0) {
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sps_seen = 1;
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*sps_size = total_size;
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} else {
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pps_seen = 1;
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*pps_size = total_size - *sps_size;
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*pps_offset = *sps_size;
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}
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}
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}
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*extradata_annexb_size = total_size;
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if (!sps_seen)
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av_log(avctx, AV_LOG_WARNING,
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"Warning: SPS NALU missing or invalid. "
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"The resulting stream may not play.\n");
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if (!pps_seen)
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av_log(avctx, AV_LOG_WARNING,
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"Warning: PPS NALU missing or invalid. "
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"The resulting stream may not play.\n");
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return 0;
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}
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static av_cold int mediacodec_decode_close(AVCodecContext *avctx)
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{
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MediaCodecH264DecContext *s = avctx->priv_data;
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ff_mediacodec_dec_close(avctx, &s->ctx);
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av_fifo_free(s->fifo);
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2016-05-26 12:52:01 +00:00
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av_bsf_free(&s->bsf);
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av_packet_unref(&s->filtered_pkt);
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2016-01-21 08:29:39 +00:00
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return 0;
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}
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static av_cold int mediacodec_decode_init(AVCodecContext *avctx)
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{
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int ret;
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FFAMediaFormat *format = NULL;
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MediaCodecH264DecContext *s = avctx->priv_data;
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format = ff_AMediaFormat_new();
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if (!format) {
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av_log(avctx, AV_LOG_ERROR, "Failed to create media format\n");
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ret = AVERROR_EXTERNAL;
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goto done;
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}
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ff_AMediaFormat_setString(format, "mime", CODEC_MIME);
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ff_AMediaFormat_setInt32(format, "width", avctx->width);
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ff_AMediaFormat_setInt32(format, "height", avctx->height);
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if (avctx->extradata[0] == 1) {
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uint8_t *extradata = NULL;
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int extradata_size = 0;
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int sps_offset, sps_size;
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int pps_offset, pps_size;
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if ((ret = h264_extradata_to_annexb_sps_pps(avctx, &extradata, &extradata_size,
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&sps_offset, &sps_size, &pps_offset, &pps_size)) < 0) {
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goto done;
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}
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ff_AMediaFormat_setBuffer(format, "csd-0", extradata + sps_offset, sps_size);
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ff_AMediaFormat_setBuffer(format, "csd-1", extradata + pps_offset, pps_size);
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av_freep(&extradata);
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} else {
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ff_AMediaFormat_setBuffer(format, "csd-0", avctx->extradata, avctx->extradata_size);
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}
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if ((ret = ff_mediacodec_dec_init(avctx, &s->ctx, CODEC_MIME, format)) < 0) {
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goto done;
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}
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av_log(avctx, AV_LOG_INFO, "MediaCodec started successfully, ret = %d\n", ret);
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s->fifo = av_fifo_alloc(sizeof(AVPacket));
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if (!s->fifo) {
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ret = AVERROR(ENOMEM);
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goto done;
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}
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2016-05-26 12:52:01 +00:00
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const AVBitStreamFilter *bsf = av_bsf_get_by_name("h264_mp4toannexb");
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if(!bsf) {
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ret = AVERROR_BSF_NOT_FOUND;
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goto done;
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}
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if ((ret = av_bsf_alloc(bsf, &s->bsf))) {
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2016-01-21 08:29:39 +00:00
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goto done;
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}
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2016-05-26 12:52:01 +00:00
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if (((ret = avcodec_parameters_from_context(s->bsf->par_in, avctx)) < 0) ||
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((ret = av_bsf_init(s->bsf)) < 0)) {
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goto done;
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}
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av_init_packet(&s->filtered_pkt);
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2016-01-21 08:29:39 +00:00
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done:
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if (format) {
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ff_AMediaFormat_delete(format);
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}
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if (ret < 0) {
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mediacodec_decode_close(avctx);
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}
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return ret;
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}
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static int mediacodec_process_data(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *pkt)
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{
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MediaCodecH264DecContext *s = avctx->priv_data;
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return ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, pkt);
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}
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static int mediacodec_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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MediaCodecH264DecContext *s = avctx->priv_data;
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AVFrame *frame = data;
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int ret;
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/* buffer the input packet */
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if (avpkt->size) {
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AVPacket input_ref = { 0 };
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if (av_fifo_space(s->fifo) < sizeof(input_ref)) {
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ret = av_fifo_realloc2(s->fifo,
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av_fifo_size(s->fifo) + sizeof(input_ref));
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if (ret < 0)
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return ret;
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}
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ret = av_packet_ref(&input_ref, avpkt);
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if (ret < 0)
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return ret;
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av_fifo_generic_write(s->fifo, &input_ref, sizeof(input_ref), NULL);
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}
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/* process buffered data */
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while (!*got_frame) {
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/* prepare the input data -- convert to Annex B if needed */
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if (s->filtered_pkt.size <= 0) {
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2016-05-26 12:52:01 +00:00
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AVPacket input_pkt = { 0 };
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av_packet_unref(&s->filtered_pkt);
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2016-01-21 08:29:39 +00:00
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/* no more data */
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if (av_fifo_size(s->fifo) < sizeof(AVPacket)) {
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return avpkt->size ? avpkt->size :
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ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, avpkt);
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}
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2016-05-26 12:52:01 +00:00
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av_fifo_generic_read(s->fifo, &input_pkt, sizeof(input_pkt), NULL);
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2016-01-21 08:29:39 +00:00
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2016-05-26 12:52:01 +00:00
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ret = av_bsf_send_packet(s->bsf, &input_pkt);
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2016-01-21 08:29:39 +00:00
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if (ret < 0) {
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2016-05-26 12:52:01 +00:00
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return ret;
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}
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ret = av_bsf_receive_packet(s->bsf, &s->filtered_pkt);
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if (ret == AVERROR(EAGAIN)) {
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goto done;
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}
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/* h264_mp4toannexb is used here and does not requires flushing */
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av_assert0(ret != AVERROR_EOF);
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if (ret < 0) {
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return ret;
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2016-01-21 08:29:39 +00:00
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}
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}
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ret = mediacodec_process_data(avctx, frame, got_frame, &s->filtered_pkt);
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if (ret < 0)
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return ret;
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s->filtered_pkt.size -= ret;
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s->filtered_pkt.data += ret;
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}
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2016-05-26 12:52:01 +00:00
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done:
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2016-01-21 08:29:39 +00:00
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return avpkt->size;
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}
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static void mediacodec_decode_flush(AVCodecContext *avctx)
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{
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MediaCodecH264DecContext *s = avctx->priv_data;
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while (av_fifo_size(s->fifo)) {
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AVPacket pkt;
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av_fifo_generic_read(s->fifo, &pkt, sizeof(pkt), NULL);
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av_packet_unref(&pkt);
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}
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av_fifo_reset(s->fifo);
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2016-05-26 12:52:01 +00:00
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av_packet_unref(&s->filtered_pkt);
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2016-01-21 08:29:39 +00:00
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ff_mediacodec_dec_flush(avctx, &s->ctx);
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}
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AVCodec ff_h264_mediacodec_decoder = {
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.name = "h264_mediacodec",
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.long_name = NULL_IF_CONFIG_SMALL("H.264 Android MediaCodec decoder"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_H264,
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.priv_data_size = sizeof(MediaCodecH264DecContext),
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.init = mediacodec_decode_init,
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.decode = mediacodec_decode_frame,
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.flush = mediacodec_decode_flush,
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.close = mediacodec_decode_close,
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.capabilities = CODEC_CAP_DELAY,
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};
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