/*
* 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/avstring.h"
#include "ffmpeg.h"
static int nb_hw_devices;
static HWDevice **hw_devices;
static 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++];
}
int hw_device_init_from_string(const char *arg, HWDevice **dev_out)
{
// "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;
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 {
// Give the device 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.
size_t index_pos;
int index, index_limit = 1000;
index_pos = strlen(type_name);
name = av_malloc(index_pos + 4);
if (!name) {
err = AVERROR(ENOMEM);
goto fail;
}
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) {
errmsg = "too many devices";
goto invalid;
}
}
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) {
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,
device ? device : p, 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 {
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;
}
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;
}
static enum AVHWDeviceType hw_device_match_type_by_hwaccel(enum HWAccelID hwaccel_id)
{
int i;
if (hwaccel_id == HWACCEL_NONE)
return AV_HWDEVICE_TYPE_NONE;
for (i = 0; hwaccels[i].name; i++) {
if (hwaccels[i].id == hwaccel_id)
return hwaccels[i].device_type;
}
return AV_HWDEVICE_TYPE_NONE;
}
static enum AVHWDeviceType hw_device_match_type_in_name(const char *codec_name)
{
const char *type_name;
enum AVHWDeviceType type;
for (type = av_hwdevice_iterate_types(AV_HWDEVICE_TYPE_NONE);
type != AV_HWDEVICE_TYPE_NONE;
type = av_hwdevice_iterate_types(type)) {
type_name = av_hwdevice_get_type_name(type);
if (strstr(codec_name, type_name))
return type;
}
return AV_HWDEVICE_TYPE_NONE;
}
int hw_device_setup_for_decode(InputStream *ist)
{
enum AVHWDeviceType type;
HWDevice *dev;
int err;
if (ist->hwaccel_device) {
dev = hw_device_get_by_name(ist->hwaccel_device);
if (!dev) {
char *tmp;
type = hw_device_match_type_by_hwaccel(ist->hwaccel_id);
if (type == AV_HWDEVICE_TYPE_NONE) {
// No match - this isn't necessarily invalid, though,
// because an explicit device might not be needed or
// the hwaccel setup could be handled elsewhere.
return 0;
}
tmp = av_asprintf("%s:%s", av_hwdevice_get_type_name(type),
ist->hwaccel_device);
if (!tmp)
return AVERROR(ENOMEM);
err = hw_device_init_from_string(tmp, &dev);
av_free(tmp);
if (err < 0)
return err;
}
} else {
if (ist->hwaccel_id != HWACCEL_NONE)
type = hw_device_match_type_by_hwaccel(ist->hwaccel_id);
else
type = hw_device_match_type_in_name(ist->dec->name);
if (type != AV_HWDEVICE_TYPE_NONE) {
dev = hw_device_get_by_type(type);
if (!dev) {
hw_device_init_from_string(av_hwdevice_get_type_name(type),
&dev);
}
} else {
// No device required.
return 0;
}
}
if (!dev) {
av_log(ist->dec_ctx, AV_LOG_WARNING, "No device available "
"for decoder (device type %s for codec %s).\n",
av_hwdevice_get_type_name(type), ist->dec->name);
return 0;
}
ist->dec_ctx->hw_device_ctx = av_buffer_ref(dev->device_ref);
if (!ist->dec_ctx->hw_device_ctx)
return AVERROR(ENOMEM);
return 0;
}
int hw_device_setup_for_encode(OutputStream *ost)
{
enum AVHWDeviceType type;
HWDevice *dev;
type = hw_device_match_type_in_name(ost->enc->name);
if (type != AV_HWDEVICE_TYPE_NONE) {
dev = hw_device_get_by_type(type);
if (!dev) {
av_log(ost->enc_ctx, AV_LOG_WARNING, "No device available "
"for encoder (device type %s for codec %s).\n",
av_hwdevice_get_type_name(type), ost->enc->name);
return 0;
}
ost->enc_ctx->hw_device_ctx = av_buffer_ref(dev->device_ref);
if (!ost->enc_ctx->hw_device_ctx)
return AVERROR(ENOMEM);
return 0;
} else {
// No device required.
return 0;
}
}
static int hwaccel_retrieve_data(AVCodecContext *avctx, AVFrame *input)
{
InputStream *ist = avctx->opaque;
AVFrame *output = NULL;
enum AVPixelFormat output_format = ist->hwaccel_output_format;
int err;
if (input->format == output_format) {
// Nothing to do.
return 0;
}
output = av_frame_alloc();
if (!output)
return AVERROR(ENOMEM);
output->format = output_format;
err = av_hwframe_transfer_data(output, input, 0);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to transfer data to "
"output frame: %d.\n", err);
goto fail;
}
err = av_frame_copy_props(output, input);
if (err < 0) {
av_frame_unref(output);
goto fail;
}
av_frame_unref(input);
av_frame_move_ref(input, output);
av_frame_free(&output);
return 0;
fail:
av_frame_free(&output);
return err;
}
int hwaccel_decode_init(AVCodecContext *avctx)
{
InputStream *ist = avctx->opaque;
ist->hwaccel_retrieve_data = &hwaccel_retrieve_data;
return 0;
}