Add an OpenH264 decoder wrapper
This is cherrypicked from libav, from commits
82b7525173f20702a8cbc26ebedbf4b69b8fecec and
d0b1e6049b06eeeeca146ece4d2f199c5dba1565.
Signed-off-by: Martin Storsjö <[email protected]>
diff --git a/libavcodec/libopenh264dec.c b/libavcodec/libopenh264dec.c
new file mode 100644
index 0000000..f642082
--- /dev/null
+++ b/libavcodec/libopenh264dec.c
@@ -0,0 +1,243 @@
+/*
+ * 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);
+
+ param.eOutputColorFormat = videoFormatI420;
+ 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,
+};
