C++ (Cpp) gst_av_codec_openの例

コード例 #1

ファイル: gstav_vdec.c プロジェクト: sequoiar/gst-av

static GstFlowReturn
pad_chain(GstPad *pad, GstBuffer *buf)
{
	struct obj *self;
	GstFlowReturn ret = GST_FLOW_OK;
	AVCodecContext *ctx;
	AVFrame *frame;
	int got_pic;
	AVPacket pkt;
	int read;

	self = (struct obj *)((GstObject *)pad)->parent;
	ctx = self->av_ctx;

	if (G_UNLIKELY(!self->initialized)) {
		GstCaps *new_caps;
		GstStructure *struc;

		self->initialized = true;
		if (gst_av_codec_open(ctx, self->codec) < 0) {
			ret = GST_FLOW_ERROR;
			goto leave;
		}

		if (self->parse_func)
			self->parse_func(self, buf);

		new_caps = gst_caps_new_empty();

		struc = gst_structure_new("video/x-raw-yuv",
				"width", G_TYPE_INT, ctx->width,
				"height", G_TYPE_INT, ctx->height,
				"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC('I','4','2','0'),
				NULL);

		if (ctx->time_base.num)
			gst_structure_set(struc,
					"framerate", GST_TYPE_FRACTION,
					ctx->time_base.den, ctx->time_base.num,
					NULL);

		if (ctx->sample_aspect_ratio.num)
			gst_structure_set(struc,
					"pixel-aspect-ratio", GST_TYPE_FRACTION,
					ctx->sample_aspect_ratio.num, ctx->sample_aspect_ratio.den,
					NULL);

		gst_caps_append_structure(new_caps, struc);

		GST_INFO_OBJECT(self, "caps are: %" GST_PTR_FORMAT, new_caps);
		gst_pad_set_caps(self->srcpad, new_caps);
		gst_caps_unref(new_caps);
	}

	av_init_packet(&pkt);
	pkt.data = buf->data;
	pkt.size = buf->size;

	frame = avcodec_alloc_frame();

	read = avcodec_decode_video2(ctx, frame, &got_pic, &pkt);
	if (read < 0) {
		GST_WARNING_OBJECT(self, "error: %i", read);
		goto leave;
	}

	if (got_pic) {
		GstBuffer *out_buf;
		out_buf = convert_frame(self, frame);
		out_buf->timestamp = buf->timestamp;
		out_buf->duration = buf->duration;
		ret = gst_pad_push(self->srcpad, out_buf);
	}

leave:
	gst_buffer_unref(buf);

	return ret;
}

コード例 #2

ファイル: gstav_vdec.c プロジェクト: sailfishos/gst-av

static GstFlowReturn
pad_chain(GstPad *pad, GstBuffer *buf)
{
	struct obj *self;
	GstFlowReturn ret = GST_FLOW_OK;
	AVCodecContext *ctx;
	AVFrame *frame = NULL;
	int got_pic;
	AVPacket pkt;
	int read;

	self = (struct obj *)((GstObject *)pad)->parent;
	GST_DEBUG_OBJECT (self, "pad chain");
	ctx = self->av_ctx;

	if (G_UNLIKELY(!self->initialized)) {
		GstCaps *new_caps;
		GstStructure *struc;

		self->initialized = true;
		if (gst_av_codec_open(ctx, self->codec) < 0) {
			ret = GST_FLOW_ERROR;
			goto leave;
		}

		if (self->parse_func)
			self->parse_func(self, buf);

		new_caps = gst_caps_new_empty();

		struc = gst_structure_new("video/x-raw-yuv",
				"width", G_TYPE_INT, ctx->width,
				"height", G_TYPE_INT, ctx->height,
				"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC('I','4','2','0'),
				NULL);

		if (ctx->time_base.num)
			gst_structure_set(struc,
					"framerate", GST_TYPE_FRACTION,
					ctx->time_base.den,
					ctx->time_base.num * ctx->ticks_per_frame,
					NULL);

		if (ctx->sample_aspect_ratio.num)
			gst_structure_set(struc,
					"pixel-aspect-ratio", GST_TYPE_FRACTION,
					ctx->sample_aspect_ratio.num, ctx->sample_aspect_ratio.den,
					NULL);

		gst_caps_append_structure(new_caps, struc);

		GST_INFO_OBJECT(self, "caps are: %" GST_PTR_FORMAT, new_caps);
		gst_pad_set_caps(self->srcpad, new_caps);
		gst_caps_unref(new_caps);
	}

	av_new_packet(&pkt, buf->size);

	memcpy(pkt.data, buf->data, buf->size);
	memset(pkt.data + pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

	frame = avcodec_alloc_frame();

	pkt.dts = pkt.pts = gstav_timestamp_to_pts(ctx, buf->timestamp);
#if LIBAVCODEC_VERSION_MAJOR < 53
	ctx->reordered_opaque = pkt.dts;
#endif

	g_mutex_lock(&self->mutex);
	read = avcodec_decode_video2(ctx, frame, &got_pic, &pkt);
	av_free_packet(&pkt);
	if (read < 0) {
		GST_WARNING_OBJECT(self, "error: %i", read);
		g_mutex_unlock(&self->mutex);
		goto leave;
	}

	if (got_pic) {
		GstBuffer *out_buf;
		out_buf = convert_frame(self, frame);
		g_mutex_unlock(&self->mutex);
		ret = gst_pad_push(self->srcpad, out_buf);
	}
	else
	  g_mutex_unlock(&self->mutex);
leave:
	av_free(frame);
	gst_buffer_unref(buf);
	GST_DEBUG_OBJECT (self, "pad chain returning %s", gst_flow_get_name (ret));
	return ret;
}