mirror of https://git.ffmpeg.org/ffmpeg.git
250 lines
7.7 KiB
C
250 lines
7.7 KiB
C
/*
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* OpenH264 video decoder
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* Copyright (C) 2016 Martin Storsjo
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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 <wels/codec_api.h>
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#include <wels/codec_ver.h>
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#include "libavutil/common.h"
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#include "libavutil/fifo.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "libopenh264.h"
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typedef struct SVCContext {
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ISVCDecoder *decoder;
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AVBSFContext *bsf;
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AVFifoBuffer *packet_fifo;
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AVPacket pkt_filtered;
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} SVCContext;
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static av_cold int svc_decode_close(AVCodecContext *avctx)
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{
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SVCContext *s = avctx->priv_data;
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AVPacket pkt;
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if (s->decoder)
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WelsDestroyDecoder(s->decoder);
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while (s->packet_fifo && av_fifo_size(s->packet_fifo) >= sizeof(pkt)) {
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av_fifo_generic_read(s->packet_fifo, &pkt, sizeof(pkt), NULL);
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av_packet_unref(&pkt);
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}
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av_bsf_free(&s->bsf);
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av_packet_unref(&s->pkt_filtered);
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av_fifo_free(s->packet_fifo);
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return 0;
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}
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static av_cold int svc_decode_init(AVCodecContext *avctx)
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{
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SVCContext *s = avctx->priv_data;
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SDecodingParam param = { 0 };
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int err;
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int log_level;
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WelsTraceCallback callback_function;
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if ((err = ff_libopenh264_check_version(avctx)) < 0)
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return err;
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s->packet_fifo = av_fifo_alloc(sizeof(AVPacket));
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if (!s->packet_fifo) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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if (WelsCreateDecoder(&s->decoder)) {
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av_log(avctx, AV_LOG_ERROR, "Unable to create decoder\n");
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err = AVERROR_UNKNOWN;
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goto fail;
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}
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// Pass all libopenh264 messages to our callback, to allow ourselves to filter them.
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log_level = WELS_LOG_DETAIL;
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callback_function = ff_libopenh264_trace_callback;
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(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_LEVEL, &log_level);
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(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK, (void *)&callback_function);
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(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK_CONTEXT, (void *)&avctx);
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#if !OPENH264_VER_AT_LEAST(1, 6)
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param.eOutputColorFormat = videoFormatI420;
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#endif
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param.eEcActiveIdc = ERROR_CON_DISABLE;
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param.sVideoProperty.eVideoBsType = VIDEO_BITSTREAM_DEFAULT;
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if ((*s->decoder)->Initialize(s->decoder, ¶m) != cmResultSuccess) {
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av_log(avctx, AV_LOG_ERROR, "Initialize failed\n");
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err = AVERROR_UNKNOWN;
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goto fail;
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}
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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fail:
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return err;
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}
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static int init_bsf(AVCodecContext *avctx)
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{
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SVCContext *s = avctx->priv_data;
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const AVBitStreamFilter *filter;
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int ret;
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if (s->bsf)
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return 0;
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// If the input stream already is annex b, this BSF only passes the
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// packets through unchanged.
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filter = av_bsf_get_by_name("h264_mp4toannexb");
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if (!filter)
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return AVERROR_BUG;
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ret = av_bsf_alloc(filter, &s->bsf);
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if (ret < 0)
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return ret;
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ret = avcodec_parameters_from_context(s->bsf->par_in, avctx);
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if (ret < 0)
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return ret;
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s->bsf->time_base_in = avctx->time_base;
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ret = av_bsf_init(s->bsf);
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if (ret < 0)
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return ret;
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return ret;
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}
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static int svc_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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SVCContext *s = avctx->priv_data;
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SBufferInfo info = { 0 };
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uint8_t* ptrs[3];
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int linesize[3];
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AVFrame *avframe = data;
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int ret;
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DECODING_STATE state;
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if ((ret = init_bsf(avctx)) < 0)
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return ret;
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if (avpkt->size) {
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AVPacket input_ref = { 0 };
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if (av_fifo_space(s->packet_fifo) < sizeof(input_ref)) {
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ret = av_fifo_realloc2(s->packet_fifo,
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av_fifo_size(s->packet_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->packet_fifo, &input_ref, sizeof(input_ref), NULL);
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}
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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->pkt_filtered.size <= 0) {
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AVPacket input_ref;
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/* no more data */
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if (av_fifo_size(s->packet_fifo) < sizeof(AVPacket))
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return avpkt->size ? avpkt->size : 0;
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av_packet_unref(&s->pkt_filtered);
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av_fifo_generic_read(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
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ret = av_bsf_send_packet(s->bsf, &input_ref);
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if (ret < 0) {
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av_packet_unref(&input_ref);
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return ret;
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}
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ret = av_bsf_receive_packet(s->bsf, &s->pkt_filtered);
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if (ret < 0)
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av_packet_move_ref(&s->pkt_filtered, &input_ref);
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else
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av_packet_unref(&input_ref);
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}
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state = (*s->decoder)->DecodeFrame2(s->decoder, s->pkt_filtered.data, s->pkt_filtered.size, ptrs, &info);
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s->pkt_filtered.size = 0;
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if (state != dsErrorFree) {
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av_log(avctx, AV_LOG_ERROR, "DecodeFrame2 failed\n");
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return AVERROR_UNKNOWN;
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}
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if (info.iBufferStatus != 1) {
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av_log(avctx, AV_LOG_DEBUG, "No frame produced\n");
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continue;
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}
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ret = ff_set_dimensions(avctx, info.UsrData.sSystemBuffer.iWidth, info.UsrData.sSystemBuffer.iHeight);
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if (ret < 0)
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return ret;
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// The decoder doesn't (currently) support decoding into a user
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// provided buffer, so do a copy instead.
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if (ff_get_buffer(avctx, avframe, 0) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Unable to allocate buffer\n");
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return AVERROR(ENOMEM);
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}
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linesize[0] = info.UsrData.sSystemBuffer.iStride[0];
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linesize[1] = linesize[2] = info.UsrData.sSystemBuffer.iStride[1];
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av_image_copy(avframe->data, avframe->linesize, (const uint8_t **) ptrs, linesize, avctx->pix_fmt, avctx->width, avctx->height);
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avframe->pts = s->pkt_filtered.pts;
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avframe->pkt_dts = s->pkt_filtered.dts;
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#if FF_API_PKT_PTS
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FF_DISABLE_DEPRECATION_WARNINGS
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avframe->pkt_pts = s->pkt_filtered.pts;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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*got_frame = 1;
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}
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return avpkt->size;
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}
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AVCodec ff_libopenh264_decoder = {
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.name = "libopenh264",
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.long_name = NULL_IF_CONFIG_SMALL("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
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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(SVCContext),
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.init = svc_decode_init,
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.decode = svc_decode_frame,
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.close = svc_decode_close,
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// The decoder doesn't currently support B-frames, and the decoder's API
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// doesn't support reordering/delay, but the BSF could incur delay.
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.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS | FF_CODEC_CAP_INIT_THREADSAFE |
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FF_CODEC_CAP_INIT_CLEANUP,
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};
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