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libavdevice/decklink: add support for -sources and -sinks arguments 

Add support for enumerating the sources/sinks via the ffmpeg
command line options, as opposed to having to create a real pipeline
and use the "-list_devices" option which does exit() after dumping
out the options.

Note that this patch preserves the existing "-list_devices" option,
but now shares common code for the actual enumeration.

Updated to reflect feedback from Marton Balint <cus@passwd.hu>.

Signed-off-by: Devin Heitmueller <dheitmueller@ltnglobal.com>
Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Devin Heitmueller 2017-10-06 08:55:43 -04:00 committed by Marton Balint
parent ff6de6b180
commit 278588cd0b
8 changed files with 104 additions and 10 deletions
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89
libavdevice/decklink_common.cpp
View File

@ -37,6 +37,7 @@ extern "C" {
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/bswap.h"
#include "avdevice.h"
}
#include "decklink_common.h"
@ -261,24 +262,100 @@ int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t directio
return ff_decklink_set_format(avctx, 0, 0, 0, 0, AV_FIELD_UNKNOWN, direction, num);
}
int ff_decklink_list_devices(AVFormatContext *avctx)
int ff_decklink_list_devices(AVFormatContext *avctx,
struct AVDeviceInfoList *device_list,
int show_inputs, int show_outputs)
{
IDeckLink *dl = NULL;
IDeckLinkIterator *iter = CreateDeckLinkIteratorInstance();
int ret = 0;
if (!iter) {
av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n");
return AVERROR(EIO);
}
av_log(avctx, AV_LOG_INFO, "Blackmagic DeckLink devices:\n");
while (iter->Next(&dl) == S_OK) {
while (ret == 0 && iter->Next(&dl) == S_OK) {
IDeckLinkOutput *output_config;
IDeckLinkInput *input_config;
const char *displayName;
AVDeviceInfo *new_device = NULL;
int add = 0;
ff_decklink_get_display_name(dl, &displayName);
av_log(avctx, AV_LOG_INFO, "\t'%s'\n", displayName);
av_free((void *) displayName);
if (show_outputs) {
if (dl->QueryInterface(IID_IDeckLinkOutput, (void **)&output_config) == S_OK) {
output_config->Release();
add = 1;
}
}
if (show_inputs) {
if (dl->QueryInterface(IID_IDeckLinkInput, (void **)&input_config) == S_OK) {
input_config->Release();
add = 1;
}
}
if (add == 1) {
new_device = (AVDeviceInfo *) av_mallocz(sizeof(AVDeviceInfo));
if (!new_device) {
ret = AVERROR(ENOMEM);
goto next;
}
new_device->device_name = av_strdup(displayName);
if (!new_device->device_name) {
ret = AVERROR(ENOMEM);
goto next;
}
new_device->device_description = av_strdup(displayName);
if (!new_device->device_description) {
av_freep(&new_device->device_name);
ret = AVERROR(ENOMEM);
goto next;
}
if ((ret = av_dynarray_add_nofree(&device_list->devices,
&device_list->nb_devices, new_device)) < 0) {
av_freep(&new_device->device_name);
av_freep(&new_device->device_description);
av_freep(&new_device);
goto next;
}
}
next:
av_freep(&displayName);
dl->Release();
}
iter->Release();
return 0;
return ret;
}
/* This is a wrapper around the ff_decklink_list_devices() which dumps the
output to av_log() and exits (for backward compatibility with the
"-list_devices" argument). */
void ff_decklink_list_devices_legacy(AVFormatContext *avctx,
int show_inputs, int show_outputs)
{
struct AVDeviceInfoList *device_list = NULL;
int ret;
device_list = (struct AVDeviceInfoList *) av_mallocz(sizeof(AVDeviceInfoList));
if (!device_list)
return;
ret = ff_decklink_list_devices(avctx, device_list, show_inputs, show_outputs);
if (ret == 0) {
av_log(avctx, AV_LOG_INFO, "Blackmagic DeckLink %s devices:\n",
show_inputs ? "input" : "output");
for (int i = 0; i < device_list->nb_devices; i++) {
av_log(avctx, AV_LOG_INFO, "\t'%s'\n", device_list->devices[i]->device_name);
}
}
avdevice_free_list_devices(&device_list);
}
int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direction)

3
libavdevice/decklink_common.h
View File

@ -135,7 +135,8 @@ static const BMDVideoConnection decklink_video_connection_map[] = {
HRESULT ff_decklink_get_display_name(IDeckLink *This, const char **displayName);
int ff_decklink_set_format(AVFormatContext *avctx, int width, int height, int tb_num, int tb_den, enum AVFieldOrder field_order, decklink_direction_t direction = DIRECTION_OUT, int num = 0);
int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction, int num);
int ff_decklink_list_devices(AVFormatContext *avctx);
int ff_decklink_list_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list, int show_inputs, int show_outputs);
void ff_decklink_list_devices_legacy(AVFormatContext *avctx, int show_inputs, int show_outputs);
int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direction = DIRECTION_OUT);
void ff_decklink_cleanup(AVFormatContext *avctx);
int ff_decklink_init_device(AVFormatContext *avctx, const char* name);

8
libavdevice/decklink_dec.cpp
View File

@ -39,6 +39,7 @@ extern "C" {
#include "libavutil/time.h"
#include "libavutil/mathematics.h"
#include "libavutil/reverse.h"
#include "avdevice.h"
#if CONFIG_LIBZVBI
#include <libzvbi.h>
#endif
@ -868,7 +869,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
/* List available devices. */
if (ctx->list_devices) {
ff_decklink_list_devices(avctx);
ff_decklink_list_devices_legacy(avctx, 1, 0);
return AVERROR_EXIT;
}
@ -1063,4 +1064,9 @@ int ff_decklink_read_packet(AVFormatContext *avctx, AVPacket *pkt)
return 0;
}
int ff_decklink_list_input_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list)
{
return ff_decklink_list_devices(avctx, device_list, 1, 0);
}
} /* extern "C" */

1
libavdevice/decklink_dec.h
View File

@ -29,6 +29,7 @@ extern "C" {
int ff_decklink_read_header(AVFormatContext *avctx);
int ff_decklink_read_packet(AVFormatContext *avctx, AVPacket *pkt);
int ff_decklink_read_close(AVFormatContext *avctx);
int ff_decklink_list_input_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list);
#ifdef __cplusplus
} /* extern "C" */

1
libavdevice/decklink_dec_c.c
View File

@ -89,6 +89,7 @@ AVInputFormat ff_decklink_demuxer = {
.flags = AVFMT_NOFILE,
.priv_class = &decklink_demuxer_class,
.priv_data_size = sizeof(struct decklink_cctx),
.get_device_list = ff_decklink_list_input_devices,
.read_header = ff_decklink_read_header,
.read_packet = ff_decklink_read_packet,
.read_close = ff_decklink_read_close,

10
libavdevice/decklink_enc.cpp
View File

@ -33,6 +33,7 @@ extern "C" {
extern "C" {
#include "libavformat/avformat.h"
#include "libavutil/imgutils.h"
#include "avdevice.h"
}
#include "decklink_common.h"
@ -335,9 +336,9 @@ av_cold int ff_decklink_write_header(AVFormatContext *avctx)
ctx->preroll = cctx->preroll;
cctx->ctx = ctx;
/* List available devices. */
/* List available devices and exit. */
if (ctx->list_devices) {
ff_decklink_list_devices(avctx);
ff_decklink_list_devices_legacy(avctx, 0, 1);
return AVERROR_EXIT;
}
@ -400,4 +401,9 @@ int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt)
return AVERROR(EIO);
}
int ff_decklink_list_output_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list)
{
return ff_decklink_list_devices(avctx, device_list, 0, 1);
}
} /* extern "C" */

1
libavdevice/decklink_enc.h
View File

@ -29,6 +29,7 @@ extern "C" {
int ff_decklink_write_header(AVFormatContext *avctx);
int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt);
int ff_decklink_write_trailer(AVFormatContext *avctx);
int ff_decklink_list_output_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list);
#ifdef __cplusplus
} /* extern "C" */

1
libavdevice/decklink_enc_c.c
View File

@ -49,6 +49,7 @@ AVOutputFormat ff_decklink_muxer = {
.video_codec = AV_CODEC_ID_WRAPPED_AVFRAME,
.subtitle_codec = AV_CODEC_ID_NONE,
.flags = AVFMT_NOFILE,
.get_device_list = ff_decklink_list_output_devices,
.priv_class = &decklink_muxer_class,
.priv_data_size = sizeof(struct decklink_cctx),
.write_header = ff_decklink_write_header,