320 lines
8.3 KiB
C
320 lines
8.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "libavutil/mem.h"
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#include "ffmpeg.h"
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static int nb_hw_devices;
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static HWDevice **hw_devices;
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HWDevice *hw_device_get_by_type(enum AVHWDeviceType type)
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{
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HWDevice *found = NULL;
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int i;
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for (i = 0; i < nb_hw_devices; i++) {
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if (hw_devices[i]->type == type) {
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if (found)
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return NULL;
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found = hw_devices[i];
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}
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}
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return found;
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}
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HWDevice *hw_device_get_by_name(const char *name)
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{
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int i;
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for (i = 0; i < nb_hw_devices; i++) {
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if (!strcmp(hw_devices[i]->name, name))
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return hw_devices[i];
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}
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return NULL;
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}
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static HWDevice *hw_device_add(void)
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{
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int err;
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err = av_reallocp_array(&hw_devices, nb_hw_devices + 1,
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sizeof(*hw_devices));
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if (err) {
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nb_hw_devices = 0;
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return NULL;
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}
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hw_devices[nb_hw_devices] = av_mallocz(sizeof(HWDevice));
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if (!hw_devices[nb_hw_devices])
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return NULL;
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return hw_devices[nb_hw_devices++];
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}
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static char *hw_device_default_name(enum AVHWDeviceType type)
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{
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// Make an automatic name of the form "type%d". We arbitrarily
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// limit at 1000 anonymous devices of the same type - there is
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// probably something else very wrong if you get to this limit.
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const char *type_name = av_hwdevice_get_type_name(type);
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char *name;
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size_t index_pos;
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int index, index_limit = 1000;
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index_pos = strlen(type_name);
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name = av_malloc(index_pos + 4);
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if (!name)
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return NULL;
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for (index = 0; index < index_limit; index++) {
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snprintf(name, index_pos + 4, "%s%d", type_name, index);
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if (!hw_device_get_by_name(name))
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break;
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}
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if (index >= index_limit) {
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av_freep(&name);
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return NULL;
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}
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return name;
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}
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int hw_device_init_from_string(const char *arg, HWDevice **dev_out)
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{
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// "type=name"
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// "type=name,key=value,key2=value2"
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// "type=name:device,key=value,key2=value2"
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// "type:device,key=value,key2=value2"
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// -> av_hwdevice_ctx_create()
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// "type=name@name"
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// "type@name"
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// -> av_hwdevice_ctx_create_derived()
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AVDictionary *options = NULL;
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const char *type_name = NULL, *name = NULL, *device = NULL;
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enum AVHWDeviceType type;
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HWDevice *dev, *src;
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AVBufferRef *device_ref = NULL;
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int err;
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const char *errmsg, *p, *q;
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size_t k;
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k = strcspn(arg, ":=@");
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p = arg + k;
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type_name = av_strndup(arg, k);
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if (!type_name) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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type = av_hwdevice_find_type_by_name(type_name);
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if (type == AV_HWDEVICE_TYPE_NONE) {
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errmsg = "unknown device type";
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goto invalid;
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}
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if (*p == '=') {
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k = strcspn(p + 1, ":@,");
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name = av_strndup(p + 1, k);
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if (!name) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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if (hw_device_get_by_name(name)) {
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errmsg = "named device already exists";
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goto invalid;
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}
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p += 1 + k;
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} else {
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name = hw_device_default_name(type);
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if (!name) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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}
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if (!*p) {
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// New device with no parameters.
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err = av_hwdevice_ctx_create(&device_ref, type,
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NULL, NULL, 0);
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if (err < 0)
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goto fail;
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} else if (*p == ':') {
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// New device with some parameters.
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++p;
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q = strchr(p, ',');
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if (q) {
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if (q - p > 0) {
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device = av_strndup(p, q - p);
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if (!device) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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}
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err = av_dict_parse_string(&options, q + 1, "=", ",", 0);
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if (err < 0) {
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errmsg = "failed to parse options";
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goto invalid;
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}
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}
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err = av_hwdevice_ctx_create(&device_ref, type,
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q ? device : p[0] ? p : NULL,
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options, 0);
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if (err < 0)
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goto fail;
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} else if (*p == '@') {
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// Derive from existing device.
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src = hw_device_get_by_name(p + 1);
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if (!src) {
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errmsg = "invalid source device name";
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goto invalid;
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}
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err = av_hwdevice_ctx_create_derived(&device_ref, type,
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src->device_ref, 0);
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if (err < 0)
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goto fail;
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} else if (*p == ',') {
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err = av_dict_parse_string(&options, p + 1, "=", ",", 0);
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if (err < 0) {
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errmsg = "failed to parse options";
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goto invalid;
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}
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err = av_hwdevice_ctx_create(&device_ref, type,
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NULL, options, 0);
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if (err < 0)
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goto fail;
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} else {
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errmsg = "parse error";
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goto invalid;
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}
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dev = hw_device_add();
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if (!dev) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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dev->name = name;
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dev->type = type;
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dev->device_ref = device_ref;
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if (dev_out)
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*dev_out = dev;
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name = NULL;
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err = 0;
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done:
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av_freep(&type_name);
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av_freep(&name);
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av_freep(&device);
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av_dict_free(&options);
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return err;
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invalid:
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av_log(NULL, AV_LOG_ERROR,
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"Invalid device specification \"%s\": %s\n", arg, errmsg);
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err = AVERROR(EINVAL);
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goto done;
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fail:
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av_log(NULL, AV_LOG_ERROR,
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"Device creation failed: %d.\n", err);
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av_buffer_unref(&device_ref);
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goto done;
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}
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int hw_device_init_from_type(enum AVHWDeviceType type,
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const char *device,
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HWDevice **dev_out)
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{
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AVBufferRef *device_ref = NULL;
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HWDevice *dev;
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char *name;
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int err;
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name = hw_device_default_name(type);
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if (!name) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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err = av_hwdevice_ctx_create(&device_ref, type, device, NULL, 0);
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if (err < 0) {
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av_log(NULL, AV_LOG_ERROR,
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"Device creation failed: %d.\n", err);
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goto fail;
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}
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dev = hw_device_add();
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if (!dev) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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dev->name = name;
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dev->type = type;
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dev->device_ref = device_ref;
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if (dev_out)
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*dev_out = dev;
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return 0;
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fail:
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av_freep(&name);
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av_buffer_unref(&device_ref);
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return err;
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}
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void hw_device_free_all(void)
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{
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int i;
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for (i = 0; i < nb_hw_devices; i++) {
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av_freep(&hw_devices[i]->name);
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av_buffer_unref(&hw_devices[i]->device_ref);
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av_freep(&hw_devices[i]);
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}
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av_freep(&hw_devices);
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nb_hw_devices = 0;
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}
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AVBufferRef *hw_device_for_filter(void)
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{
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// Pick the last hardware device if the user doesn't pick the device for
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// filters explicitly with the filter_hw_device option.
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if (filter_hw_device)
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return filter_hw_device->device_ref;
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else if (nb_hw_devices > 0) {
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HWDevice *dev = hw_devices[nb_hw_devices - 1];
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if (nb_hw_devices > 1)
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av_log(NULL, AV_LOG_WARNING, "There are %d hardware devices. device "
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"%s of type %s is picked for filters by default. Set hardware "
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"device explicitly with the filter_hw_device option if device "
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"%s is not usable for filters.\n",
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nb_hw_devices, dev->name,
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av_hwdevice_get_type_name(dev->type), dev->name);
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return dev->device_ref;
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}
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return NULL;
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}
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