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FFmpeg/libavdevice/libdc1394.c
Carl Eugen Hoyos 285c015f10 lavd/libdc1394: Do not crash if dc1394_camera_new() fails. 
Fixes Ubuntu bug 1710849
2017-08-18 19:20:15 +02:00

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/*
* IIDC1394 grab interface (uses libdc1394 and libraw1394)
* Copyright (c) 2004 Roman Shaposhnik
* Copyright (c) 2008 Alessandro Sappia
*
* 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 <dc1394/dc1394.h>
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/log.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavformat/avformat.h"
#include "libavformat/internal.h"
typedef struct dc1394_data {
AVClass *class;
dc1394_t *d;
dc1394camera_t *camera;
dc1394video_frame_t *frame;
int current_frame;
int frame_rate; /**< frames per 1000 seconds (fps * 1000) */
char *video_size; /**< String describing video size, set by a private option. */
char *pixel_format; /**< Set by a private option. */
char *framerate; /**< Set by a private option. */
int size;
int stream_index;
} dc1394_data;
static const struct dc1394_frame_format {
int width;
int height;
enum AVPixelFormat pix_fmt;
int frame_size_id;
} dc1394_frame_formats[] = {
{ 320, 240, AV_PIX_FMT_UYVY422, DC1394_VIDEO_MODE_320x240_YUV422 },
{ 640, 480, AV_PIX_FMT_GRAY8, DC1394_VIDEO_MODE_640x480_MONO8 },
{ 640, 480, AV_PIX_FMT_UYYVYY411, DC1394_VIDEO_MODE_640x480_YUV411 },
{ 640, 480, AV_PIX_FMT_UYVY422, DC1394_VIDEO_MODE_640x480_YUV422 },
{ 0, 0, 0, 0 } /* gotta be the last one */
};
static const struct dc1394_frame_rate {
int frame_rate;
int frame_rate_id;
} dc1394_frame_rates[] = {
{ 1875, DC1394_FRAMERATE_1_875 },
{ 3750, DC1394_FRAMERATE_3_75 },
{ 7500, DC1394_FRAMERATE_7_5 },
{ 15000, DC1394_FRAMERATE_15 },
{ 30000, DC1394_FRAMERATE_30 },
{ 60000, DC1394_FRAMERATE_60 },
{120000, DC1394_FRAMERATE_120 },
{240000, DC1394_FRAMERATE_240 },
{ 0, 0 } /* gotta be the last one */
};
#define OFFSET(x) offsetof(dc1394_data, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "qvga"}, 0, 0, DEC },
{ "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "uyvy422"}, 0, 0, DEC },
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
{ NULL },
};
static const AVClass libdc1394_class = {
.class_name = "libdc1394 indev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
};
static inline int dc1394_read_common(AVFormatContext *c,
const struct dc1394_frame_format **select_fmt, const struct dc1394_frame_rate **select_fps)
{
dc1394_data* dc1394 = c->priv_data;
AVStream* vst;
const struct dc1394_frame_format *fmt;
const struct dc1394_frame_rate *fps;
enum AVPixelFormat pix_fmt;
int width, height;
AVRational framerate;
int ret = 0;
if ((pix_fmt = av_get_pix_fmt(dc1394->pixel_format)) == AV_PIX_FMT_NONE) {
av_log(c, AV_LOG_ERROR, "No such pixel format: %s.\n", dc1394->pixel_format);
ret = AVERROR(EINVAL);
goto out;
}
if ((ret = av_parse_video_size(&width, &height, dc1394->video_size)) < 0) {
av_log(c, AV_LOG_ERROR, "Could not parse video size '%s'.\n", dc1394->video_size);
goto out;
}
if ((ret = av_parse_video_rate(&framerate, dc1394->framerate)) < 0) {
av_log(c, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", dc1394->framerate);
goto out;
}
dc1394->frame_rate = av_rescale(1000, framerate.num, framerate.den);
for (fmt = dc1394_frame_formats; fmt->width; fmt++)
if (fmt->pix_fmt == pix_fmt && fmt->width == width && fmt->height == height)
break;
for (fps = dc1394_frame_rates; fps->frame_rate; fps++)
if (fps->frame_rate == dc1394->frame_rate)
break;
if (!fps->frame_rate || !fmt->width) {
av_log(c, AV_LOG_ERROR, "Can't find matching camera format for %s, %dx%d@%d:1000fps\n", av_get_pix_fmt_name(pix_fmt),
width, height, dc1394->frame_rate);
ret = AVERROR(EINVAL);
goto out;
}
/* create a video stream */
vst = avformat_new_stream(c, NULL);
if (!vst) {
ret = AVERROR(ENOMEM);
goto out;
}
avpriv_set_pts_info(vst, 64, 1, 1000);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
vst->codecpar->width = fmt->width;
vst->codecpar->height = fmt->height;
vst->codecpar->format = fmt->pix_fmt;
vst->avg_frame_rate = framerate;
dc1394->current_frame = 0;
dc1394->stream_index = vst->index;
dc1394->size = av_image_get_buffer_size(fmt->pix_fmt,
fmt->width, fmt->height, 1);
vst->codecpar->bit_rate = av_rescale(dc1394->size * 8,
fps->frame_rate, 1000);
*select_fps = fps;
*select_fmt = fmt;
out:
return ret;
}
static int dc1394_read_header(AVFormatContext *c)
{
dc1394_data* dc1394 = c->priv_data;
dc1394camera_list_t *list;
int res, i;
const struct dc1394_frame_format *fmt = NULL;
const struct dc1394_frame_rate *fps = NULL;
if (dc1394_read_common(c, &fmt, &fps) != 0)
return -1;
/* Now let us prep the hardware. */
dc1394->d = dc1394_new();
if (dc1394_camera_enumerate(dc1394->d, &list) != DC1394_SUCCESS || !list) {
av_log(c, AV_LOG_ERROR, "Unable to look for an IIDC camera.\n");
goto out;
}
if (list->num == 0) {
av_log(c, AV_LOG_ERROR, "No cameras found.\n");
dc1394_camera_free_list(list);
goto out;
}
/* FIXME: To select a specific camera I need to search in list its guid */
dc1394->camera = dc1394_camera_new (dc1394->d, list->ids[0].guid);
if (!dc1394->camera) {
av_log(c, AV_LOG_ERROR, "Unable to open camera with guid 0x%"PRIx64"\n",
list->ids[0].guid);
dc1394_camera_free_list(list);
goto out;
}
if (list->num > 1) {
av_log(c, AV_LOG_INFO, "Working with the first camera found\n");
}
/* Freeing list of cameras */
dc1394_camera_free_list (list);
/* Select MAX Speed possible from the cam */
if (dc1394->camera->bmode_capable>0) {
dc1394_video_set_operation_mode(dc1394->camera, DC1394_OPERATION_MODE_1394B);
i = DC1394_ISO_SPEED_800;
} else {
i = DC1394_ISO_SPEED_400;
}
for (res = DC1394_FAILURE; i >= DC1394_ISO_SPEED_MIN && res != DC1394_SUCCESS; i--) {
res=dc1394_video_set_iso_speed(dc1394->camera, i);
}
if (res != DC1394_SUCCESS) {
av_log(c, AV_LOG_ERROR, "Couldn't set ISO Speed\n");
goto out_camera;
}
if (dc1394_video_set_mode(dc1394->camera, fmt->frame_size_id) != DC1394_SUCCESS) {
av_log(c, AV_LOG_ERROR, "Couldn't set video format\n");
goto out_camera;
}
if (dc1394_video_set_framerate(dc1394->camera,fps->frame_rate_id) != DC1394_SUCCESS) {
av_log(c, AV_LOG_ERROR, "Couldn't set framerate %d \n",fps->frame_rate);
goto out_camera;
}
if (dc1394_capture_setup(dc1394->camera, 10, DC1394_CAPTURE_FLAGS_DEFAULT)!=DC1394_SUCCESS) {
av_log(c, AV_LOG_ERROR, "Cannot setup camera \n");
goto out_camera;
}
if (dc1394_video_set_transmission(dc1394->camera, DC1394_ON) !=DC1394_SUCCESS) {
av_log(c, AV_LOG_ERROR, "Cannot start capture\n");
goto out_camera;
}
return 0;
out_camera:
dc1394_capture_stop(dc1394->camera);
dc1394_video_set_transmission(dc1394->camera, DC1394_OFF);
dc1394_camera_free (dc1394->camera);
out:
dc1394_free(dc1394->d);
return -1;
}
static int dc1394_read_packet(AVFormatContext *c, AVPacket *pkt)
{
struct dc1394_data *dc1394 = c->priv_data;
int res;
/* discard stale frame */
if (dc1394->current_frame++) {
if (dc1394_capture_enqueue(dc1394->camera, dc1394->frame) != DC1394_SUCCESS)
av_log(c, AV_LOG_ERROR, "failed to release %d frame\n", dc1394->current_frame);
}
res = dc1394_capture_dequeue(dc1394->camera, DC1394_CAPTURE_POLICY_WAIT, &dc1394->frame);
if (res == DC1394_SUCCESS) {
pkt->data = (uint8_t *)dc1394->frame->image;
pkt->size = dc1394->frame->image_bytes;
pkt->pts = dc1394->current_frame * 1000000 / dc1394->frame_rate;
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->stream_index = dc1394->stream_index;
} else {
av_log(c, AV_LOG_ERROR, "DMA capture failed\n");
return AVERROR_INVALIDDATA;
}
return pkt->size;
}
static int dc1394_close(AVFormatContext * context)
{
struct dc1394_data *dc1394 = context->priv_data;
dc1394_video_set_transmission(dc1394->camera, DC1394_OFF);
dc1394_capture_stop(dc1394->camera);
dc1394_camera_free(dc1394->camera);
dc1394_free(dc1394->d);
return 0;
}
AVInputFormat ff_libdc1394_demuxer = {
.name = "libdc1394",
.long_name = NULL_IF_CONFIG_SMALL("dc1394 v.2 A/V grab"),
.priv_data_size = sizeof(struct dc1394_data),
.read_header = dc1394_read_header,
.read_packet = dc1394_read_packet,
.read_close = dc1394_close,
.flags = AVFMT_NOFILE,
.priv_class = &libdc1394_class,
};
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