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ffmpeg/fftools/ffmpeg_hw.c

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/*
* 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 <string.h>
#include "libavutil/mem.h"
#include "ffmpeg.h"
static int nb_hw_devices;
static HWDevice **hw_devices;
HWDevice *hw_device_get_by_type(enum AVHWDeviceType type)
{
HWDevice *found = NULL;
int i;
for (i = 0; i < nb_hw_devices; i++) {
if (hw_devices[i]->type == type) {
if (found)
return NULL;
found = hw_devices[i];
}
}
return found;
}
HWDevice *hw_device_get_by_name(const char *name)
{
int i;
for (i = 0; i < nb_hw_devices; i++) {
if (!strcmp(hw_devices[i]->name, name))
return hw_devices[i];
}
return NULL;
}
static HWDevice *hw_device_add(void)
{
int err;
err = av_reallocp_array(&hw_devices, nb_hw_devices + 1,
sizeof(*hw_devices));
if (err) {
nb_hw_devices = 0;
return NULL;
}
hw_devices[nb_hw_devices] = av_mallocz(sizeof(HWDevice));
if (!hw_devices[nb_hw_devices])
return NULL;
return hw_devices[nb_hw_devices++];
}
static char *hw_device_default_name(enum AVHWDeviceType type)
{
// Make an automatic name of the form "type%d". We arbitrarily
// limit at 1000 anonymous devices of the same type - there is
// probably something else very wrong if you get to this limit.
const char *type_name = av_hwdevice_get_type_name(type);
char *name;
size_t index_pos;
int index, index_limit = 1000;
index_pos = strlen(type_name);
name = av_malloc(index_pos + 4);
if (!name)
return NULL;
for (index = 0; index < index_limit; index++) {
snprintf(name, index_pos + 4, "%s%d", type_name, index);
if (!hw_device_get_by_name(name))
break;
}
if (index >= index_limit) {
av_freep(&name);
return NULL;
}
return name;
}
int hw_device_init_from_string(const char *arg, HWDevice **dev_out)
{
// "type=name"
// "type=name,key=value,key2=value2"
// "type=name:device,key=value,key2=value2"
// "type:device,key=value,key2=value2"
// -> av_hwdevice_ctx_create()
// "type=name@name"
// "type@name"
// -> av_hwdevice_ctx_create_derived()
AVDictionary *options = NULL;
const char *type_name = NULL, *name = NULL, *device = NULL;
enum AVHWDeviceType type;
HWDevice *dev, *src;
AVBufferRef *device_ref = NULL;
int err;
const char *errmsg, *p, *q;
size_t k;
k = strcspn(arg, ":=@");
p = arg + k;
type_name = av_strndup(arg, k);
if (!type_name) {
err = AVERROR(ENOMEM);
goto fail;
}
type = av_hwdevice_find_type_by_name(type_name);
if (type == AV_HWDEVICE_TYPE_NONE) {
errmsg = "unknown device type";
goto invalid;
}
if (*p == '=') {
k = strcspn(p + 1, ":@,");
name = av_strndup(p + 1, k);
if (!name) {
err = AVERROR(ENOMEM);
goto fail;
}
if (hw_device_get_by_name(name)) {
errmsg = "named device already exists";
goto invalid;
}
p += 1 + k;
} else {
name = hw_device_default_name(type);
if (!name) {
err = AVERROR(ENOMEM);
goto fail;
}
}
if (!*p) {
// New device with no parameters.
err = av_hwdevice_ctx_create(&device_ref, type,
NULL, NULL, 0);
if (err < 0)
goto fail;
} else if (*p == ':') {
// New device with some parameters.
++p;
q = strchr(p, ',');
if (q) {
if (q - p > 0) {
device = av_strndup(p, q - p);
if (!device) {
err = AVERROR(ENOMEM);
goto fail;
}
}
err = av_dict_parse_string(&options, q + 1, "=", ",", 0);
if (err < 0) {
errmsg = "failed to parse options";
goto invalid;
}
}
err = av_hwdevice_ctx_create(&device_ref, type,
q ? device : p[0] ? p : NULL,
options, 0);
if (err < 0)
goto fail;
} else if (*p == '@') {
// Derive from existing device.
src = hw_device_get_by_name(p + 1);
if (!src) {
errmsg = "invalid source device name";
goto invalid;
}
err = av_hwdevice_ctx_create_derived(&device_ref, type,
src->device_ref, 0);
if (err < 0)
goto fail;
} else if (*p == ',') {
err = av_dict_parse_string(&options, p + 1, "=", ",", 0);
if (err < 0) {
errmsg = "failed to parse options";
goto invalid;
}
err = av_hwdevice_ctx_create(&device_ref, type,
NULL, options, 0);
if (err < 0)
goto fail;
} else {
errmsg = "parse error";
goto invalid;
}
dev = hw_device_add();
if (!dev) {
err = AVERROR(ENOMEM);
goto fail;
}
dev->name = name;
dev->type = type;
dev->device_ref = device_ref;
if (dev_out)
*dev_out = dev;
name = NULL;
err = 0;
done:
av_freep(&type_name);
av_freep(&name);
av_freep(&device);
av_dict_free(&options);
return err;
invalid:
av_log(NULL, AV_LOG_ERROR,
"Invalid device specification \"%s\": %s\n", arg, errmsg);
err = AVERROR(EINVAL);
goto done;
fail:
av_log(NULL, AV_LOG_ERROR,
"Device creation failed: %d.\n", err);
av_buffer_unref(&device_ref);
goto done;
}
int hw_device_init_from_type(enum AVHWDeviceType type,
const char *device,
HWDevice **dev_out)
{
AVBufferRef *device_ref = NULL;
HWDevice *dev;
char *name;
int err;
name = hw_device_default_name(type);
if (!name) {
err = AVERROR(ENOMEM);
goto fail;
}
err = av_hwdevice_ctx_create(&device_ref, type, device, NULL, 0);
if (err < 0) {
av_log(NULL, AV_LOG_ERROR,
"Device creation failed: %d.\n", err);
goto fail;
}
dev = hw_device_add();
if (!dev) {
err = AVERROR(ENOMEM);
goto fail;
}
dev->name = name;
dev->type = type;
dev->device_ref = device_ref;
if (dev_out)
*dev_out = dev;
return 0;
fail:
av_freep(&name);
av_buffer_unref(&device_ref);
return err;
}
void hw_device_free_all(void)
{
int i;
for (i = 0; i < nb_hw_devices; i++) {
av_freep(&hw_devices[i]->name);
av_buffer_unref(&hw_devices[i]->device_ref);
av_freep(&hw_devices[i]);
}
av_freep(&hw_devices);
nb_hw_devices = 0;
}
AVBufferRef *hw_device_for_filter(void)
{
// Pick the last hardware device if the user doesn't pick the device for
// filters explicitly with the filter_hw_device option.
if (filter_hw_device)
return filter_hw_device->device_ref;
else if (nb_hw_devices > 0) {
HWDevice *dev = hw_devices[nb_hw_devices - 1];
if (nb_hw_devices > 1)
av_log(NULL, AV_LOG_WARNING, "There are %d hardware devices. device "
"%s of type %s is picked for filters by default. Set hardware "
"device explicitly with the filter_hw_device option if device "
"%s is not usable for filters.\n",
nb_hw_devices, dev->name,
av_hwdevice_get_type_name(dev->type), dev->name);
return dev->device_ref;
}
return NULL;
}
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