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linux-v4l2: Add support for H.264

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This commit is contained in:
Grzegorz Godlewski 2022-03-18 19:56:21 +01:00 committed by Matt Gajownik
parent a1f9170180
commit c5015d0e6c
4 changed files with 56 additions and 36 deletions
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2
plugins/linux-v4l2/CMakeLists.txt
View File

@ -15,7 +15,7 @@ add_library(linux-v4l2 MODULE)
add_library(OBS::v4l2 ALIAS linux-v4l2)
target_sources(linux-v4l2 PRIVATE linux-v4l2.c v4l2-controls.c v4l2-input.c
v4l2-helpers.c v4l2-output.c v4l2-mjpeg.c)
v4l2-helpers.c v4l2-output.c v4l2-decoder.c)
target_link_libraries(
linux-v4l2 PRIVATE OBS::libobs LIB4L2::LIB4L2 FFmpeg::avcodec

31
plugins/linux-v4l2/v4l2-mjpeg.c → plugins/linux-v4l2/v4l2-decoder.c
View File

@ -16,16 +16,26 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <obs-module.h>
#include <linux/videodev2.h>
#include "v4l2-mjpeg.h"
#include "v4l2-decoder.h"
#define blog(level, msg, ...) \
blog(level, "v4l2-input: mjpeg: " msg, ##__VA_ARGS__)
blog(level, "v4l2-input: decoder: " msg, ##__VA_ARGS__)
int v4l2_init_mjpeg(struct v4l2_mjpeg_decoder *decoder)
int v4l2_init_decoder(struct v4l2_decoder *decoder, int pixfmt)
{
decoder->codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
if (pixfmt == V4L2_PIX_FMT_MJPEG) {
decoder->codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
} else if (pixfmt == V4L2_PIX_FMT_H264) {
decoder->codec = avcodec_find_decoder(AV_CODEC_ID_H264);
}
if (!decoder->codec) {
if (pixfmt == V4L2_PIX_FMT_MJPEG) {
blog(LOG_ERROR, "failed to find MJPEG decoder");
} else if (pixfmt == V4L2_PIX_FMT_H264) {
blog(LOG_ERROR, "failed to find H264 decoder");
}
return -1;
}
@ -56,7 +66,7 @@ int v4l2_init_mjpeg(struct v4l2_mjpeg_decoder *decoder)
return 0;
}
void v4l2_destroy_mjpeg(struct v4l2_mjpeg_decoder *decoder)
void v4l2_destroy_decoder(struct v4l2_decoder *decoder)
{
blog(LOG_DEBUG, "destroying avcodec");
if (decoder->frame) {
@ -68,22 +78,23 @@ void v4l2_destroy_mjpeg(struct v4l2_mjpeg_decoder *decoder)
}
if (decoder->context) {
avcodec_close(decoder->context);
avcodec_free_context(&decoder->context);
}
}
int v4l2_decode_mjpeg(struct obs_source_frame *out, uint8_t *data,
size_t length, struct v4l2_mjpeg_decoder *decoder)
int v4l2_decode_frame(struct obs_source_frame *out, uint8_t *data,
size_t length, struct v4l2_decoder *decoder)
{
decoder->packet->data = data;
decoder->packet->size = length;
if (avcodec_send_packet(decoder->context, decoder->packet) < 0) {
blog(LOG_ERROR, "failed to send jpeg to codec");
blog(LOG_ERROR, "failed to send frame to codec");
return -1;
}
if (avcodec_receive_frame(decoder->context, decoder->frame) < 0) {
blog(LOG_ERROR, "failed to recieve frame from codec");
blog(LOG_ERROR, "failed to receive frame from codec");
return -1;
}
@ -105,8 +116,6 @@ int v4l2_decode_mjpeg(struct obs_source_frame *out, uint8_t *data,
case AV_PIX_FMT_YUV444P:
out->format = VIDEO_FORMAT_I444;
break;
default:
break;
}
return 0;

25
plugins/linux-v4l2/v4l2-mjpeg.h → plugins/linux-v4l2/v4l2-decoder.h
View File

@ -26,42 +26,43 @@ extern "C" {
#include <libavutil/pixfmt.h>
/**
* Data structure for mjpeg decoding
* Data structure for decoder
*/
struct v4l2_mjpeg_decoder {
const AVCodec *codec;
struct v4l2_decoder {
AVCodec *codec;
AVCodecContext *context;
AVPacket *packet;
AVFrame *frame;
};
/**
* Initialize the mjpeg decoder.
* Initialize the decoder.
* The decoder must be destroyed on failure.
*
* @param props the decoder structure
* @param decoder the decoder structure
* @param pixfmt which codec is used
* @return non-zero on failure
*/
int v4l2_init_mjpeg(struct v4l2_mjpeg_decoder *decoder);
int v4l2_init_decoder(struct v4l2_decoder *decoder, int pixfmt);
/**
* Free any data associated with the decoder.
*
* @param decoder the decoder structure
*/
void v4l2_destroy_mjpeg(struct v4l2_mjpeg_decoder *decoder);
void v4l2_destroy_decoder(struct v4l2_decoder *decoder);
/**
* Decode a jpeg into an obs frame
* Decode a jpeg or h264 frame into an obs frame
*
* @param out the obs frame to decode into
* @param data the jpeg data
* @param data the codec data
* @param length length of the data
* @param decoder the decoder as initialized by v4l2_init_mjpeg
* @param decoder the decoder as initialized by v4l2_init_decoder
* @return non-zero on failure
*/
int v4l2_decode_mjpeg(struct obs_source_frame *out, uint8_t *data,
size_t length, struct v4l2_mjpeg_decoder *decoder);
int v4l2_decode_frame(struct obs_source_frame *out, uint8_t *data,
size_t length, struct v4l2_decoder *decoder);
#ifdef __cplusplus
}

34
plugins/linux-v4l2/v4l2-input.c
View File

@ -37,7 +37,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "v4l2-controls.h"
#include "v4l2-helpers.h"
#include "v4l2-mjpeg.h"
#include "v4l2-decoder.h"
#if HAVE_UDEV
#include "v4l2-udev.h"
@ -81,7 +81,7 @@ struct v4l2_data {
obs_source_t *source;
pthread_t thread;
os_event_t *event;
struct v4l2_mjpeg_decoder mjpeg_decoder;
struct v4l2_decoder decoder;
bool framerate_unchanged;
bool resolution_unchanged;
@ -268,10 +268,12 @@ static void *v4l2_thread(void *vptr)
start = (uint8_t *)data->buffers.info[buf.index].start;
if (data->pixfmt == V4L2_PIX_FMT_MJPEG) {
if (v4l2_decode_mjpeg(&out, start, buf.bytesused,
&data->mjpeg_decoder) < 0) {
blog(LOG_ERROR, "failed to unpack jpeg");
if (data->pixfmt == V4L2_PIX_FMT_MJPEG ||
data->pixfmt == V4L2_PIX_FMT_H264) {
if (v4l2_decode_frame(&out, start, buf.bytesused,
&data->decoder) < 0) {
blog(LOG_ERROR,
"failed to unpack jpeg or h264");
break;
}
} else {
@ -477,7 +479,8 @@ static void v4l2_format_list(int dev, obs_property_t *prop)
if (v4l2_to_obs_video_format(fmt.pixelformat) !=
VIDEO_FORMAT_NONE ||
fmt.pixelformat == V4L2_PIX_FMT_MJPEG) {
fmt.pixelformat == V4L2_PIX_FMT_MJPEG ||
fmt.pixelformat == V4L2_PIX_FMT_H264) {
obs_property_list_add_int(prop, buffer.array,
fmt.pixelformat);
blog(LOG_INFO, "Pixelformat: %s (available)",
@ -910,7 +913,10 @@ static void v4l2_terminate(struct v4l2_data *data)
data->thread = 0;
}
v4l2_destroy_mjpeg(&data->mjpeg_decoder);
if (data->pixfmt == V4L2_PIX_FMT_MJPEG ||
data->pixfmt == V4L2_PIX_FMT_H264) {
v4l2_destroy_decoder(&data->decoder);
}
v4l2_destroy_mmap(&data->buffers);
if (data->dev != -1) {
@ -1002,7 +1008,8 @@ static void v4l2_init(struct v4l2_data *data)
goto fail;
}
if (v4l2_to_obs_video_format(data->pixfmt) == VIDEO_FORMAT_NONE &&
data->pixfmt != V4L2_PIX_FMT_MJPEG) {
data->pixfmt != V4L2_PIX_FMT_MJPEG &&
data->pixfmt != V4L2_PIX_FMT_H264) {
blog(LOG_ERROR, "Selected video format not supported");
goto fail;
}
@ -1025,9 +1032,12 @@ static void v4l2_init(struct v4l2_data *data)
goto fail;
}
if (v4l2_init_mjpeg(&data->mjpeg_decoder) < 0) {
blog(LOG_ERROR, "Failed to initialize mjpeg decoder");
goto fail;
if (data->pixfmt == V4L2_PIX_FMT_MJPEG ||
data->pixfmt == V4L2_PIX_FMT_H264) {
if (v4l2_init_decoder(&data->decoder, data->pixfmt) < 0) {
blog(LOG_ERROR, "Failed to initialize decoder");
goto fail;
}
}
/* start the capture thread */