diff options
Diffstat (limited to 'libavcodec/libopenh264dec.c')
-rw-r--r-- | libavcodec/libopenh264dec.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/libavcodec/libopenh264dec.c b/libavcodec/libopenh264dec.c new file mode 100644 index 0000000000..6af60af434 --- /dev/null +++ b/libavcodec/libopenh264dec.c @@ -0,0 +1,245 @@ +/* + * 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, ¶m) != 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; + avframe->pkt_pts = s->pkt_filtered.pts; + + *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, +}; |