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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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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