Start custom ffmpeg implementation
For now, only device scanning is working
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2
Makefile
2
Makefile
@ -30,7 +30,7 @@ C_DEFS=
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#list all ASM defines here with -D before the name
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A_DEFS=
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#list all linker flags here with -l before the name
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LDFLAGS=-lavcodec -lavformat -lavutil -lavdevice
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LDFLAGS=-lavcodec -lavformat -lavutil -lavdevice -lv4l2
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# --- general settings
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# RELEASE=0 -> disable optimisation, then enable debug
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98
src/ffmpeg.c
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98
src/ffmpeg.c
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@ -0,0 +1,98 @@
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/** @file ffmpeg.c
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*
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*/
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//--includes--------------------------------------------------------------------
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#include <libavdevice/avdevice.h>
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#include <time.h> //required by videodev2.h
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#include <linux/videodev2.h>
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#include <libv4l2.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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//--local definitions-----------------------------------------------------------
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const AVDeviceInfo* find_h264_device(const AVDeviceInfoList* device_list);
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//--local variables-------------------------------------------------------------
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//--public functions------------------------------------------------------------
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int ffmpeg_init(void)
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{
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avdevice_register_all();
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const AVInputFormat* v4l2_format = av_find_input_format("v4l2");
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AVDeviceInfoList* device_info_list;
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int device_nb = avdevice_list_input_sources(v4l2_format, nullptr, nullptr,
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&device_info_list);
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if (device_nb < 0) {
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fprintf(stderr, "Failed to list available devices\n");
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avdevice_free_list_devices(&device_info_list);
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return -1;
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} else if (device_nb == 0) {
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fprintf(stderr, "No compatible input device found\n");
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avdevice_free_list_devices(&device_info_list);
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return -1;
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}
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const AVDeviceInfo* device = find_h264_device(device_info_list);
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if (device == nullptr) {
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fprintf(stderr, "No H264 device found\n");
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avdevice_free_list_devices(&device_info_list);
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return -1;
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}
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printf("Found compatible device: %s\n%s\n",
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device->device_name,
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device->device_description);
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avdevice_free_list_devices(&device_info_list);
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return 0;
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}
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void ffmpeg_deinit()
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{
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}
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//--local functions-------------------------------------------------------------
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const AVDeviceInfo* find_h264_device(const AVDeviceInfoList* device_list)
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{
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for (int i=0; i<device_list->nb_devices; ++i) {
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const AVDeviceInfo* device = device_list->devices[i];
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int fd;
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if ((fd = v4l2_open(device->device_name, O_RDWR)) < 0) {
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fprintf(stderr, "Failed to open: %s, ignoring...\n",
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device->device_name);
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continue;
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}
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bool found = false;
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struct v4l2_fmtdesc fmt;
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fmt.index = 0;
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fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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while (v4l2_ioctl(fd, VIDIOC_ENUM_FMT, &fmt) >= 0) {
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if (fmt.pixelformat == V4L2_PIX_FMT_H264) {
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found = true;
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break;
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}
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++fmt.index;
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}
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v4l2_close(fd);
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if (found == true) {
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return device;
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}
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}
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return nullptr;
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}
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22
src/ffmpeg.h
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22
src/ffmpeg.h
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@ -0,0 +1,22 @@
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/** @file ffmpeg.h
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*
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*/
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//--includes--------------------------------------------------------------------
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#include <stdint.h>
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//--local definitions-----------------------------------------------------------
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//--local variables-------------------------------------------------------------
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//--public functions------------------------------------------------------------
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int ffmpeg_init();
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int ffmpeg_deinit();
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int ffmpeg_read_frame(uint8_t* some_data);
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//--local functions-------------------------------------------------------------
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228
src/main.c
228
src/main.c
@ -1,228 +1,10 @@
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#include <stdio.h>
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/mem.h>
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#include <libavutil/pixdesc.h>
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#include <libavutil/hwcontext.h>
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#include <libavutil/opt.h>
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#include <libavutil/avassert.h>
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#include <libavutil/imgutils.h>
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#include <libavdevice/avdevice.h>
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#include "ffmpeg.h"
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static AVBufferRef *hw_device_ctx = NULL;
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static enum AVPixelFormat hw_pix_fmt;
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static FILE *output_file = NULL;
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static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type)
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int main(void)
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{
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int err = 0;
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ffmpeg_init();
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ffmpeg_deinit();
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if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type,
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NULL, NULL, 0)) < 0) {
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fprintf(stderr, "Failed to create specified HW device.\n");
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return err;
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}
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ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
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return err;
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return 0;
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}
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static enum AVPixelFormat get_hw_format(AVCodecContext *ctx,
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const enum AVPixelFormat *pix_fmts)
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{
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const enum AVPixelFormat *p;
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for (p = pix_fmts; *p != -1; p++) {
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if (*p == hw_pix_fmt)
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return *p;
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}
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fprintf(stderr, "Failed to get HW surface format.\n");
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return AV_PIX_FMT_NONE;
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}
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static int decode_write(AVCodecContext *avctx, AVPacket *packet)
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{
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AVFrame *frame = NULL, *sw_frame = NULL;
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AVFrame *tmp_frame = NULL;
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uint8_t *buffer = NULL;
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int size;
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int ret = 0;
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ret = avcodec_send_packet(avctx, packet);
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if (ret < 0) {
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fprintf(stderr, "Error during decoding\n");
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return ret;
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}
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while (1) {
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if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) {
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fprintf(stderr, "Can not alloc frame\n");
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ret = avcodec_receive_frame(avctx, frame);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
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av_frame_free(&frame);
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av_frame_free(&sw_frame);
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return 0;
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} else if (ret < 0) {
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fprintf(stderr, "Error while decoding\n");
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goto fail;
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}
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if (frame->format == hw_pix_fmt) {
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/* retrieve data from GPU to CPU */
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if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) {
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fprintf(stderr, "Error transferring the data to system memory\n");
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goto fail;
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}
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tmp_frame = sw_frame;
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} else
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tmp_frame = frame;
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size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width,
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tmp_frame->height, 1);
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buffer = av_malloc(size);
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if (!buffer) {
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fprintf(stderr, "Can not alloc buffer\n");
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ret = av_image_copy_to_buffer(buffer, size,
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(const uint8_t * const *)tmp_frame->data,
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(const int *)tmp_frame->linesize, tmp_frame->format,
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tmp_frame->width, tmp_frame->height, 1);
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if (ret < 0) {
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fprintf(stderr, "Can not copy image to buffer\n");
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goto fail;
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}
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if ((ret = fwrite(buffer, 1, size, output_file)) < 0) {
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fprintf(stderr, "Failed to dump raw data.\n");
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goto fail;
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}
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fail:
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av_frame_free(&frame);
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av_frame_free(&sw_frame);
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av_freep(&buffer);
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if (ret < 0)
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return ret;
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}
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}
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int main(int argc, char *argv[])
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{
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AVFormatContext *input_ctx = NULL;
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int video_stream, ret;
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AVStream *video = NULL;
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AVCodecContext *decoder_ctx = NULL;
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const AVCodec *decoder = NULL;
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AVPacket *packet = NULL;
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enum AVHWDeviceType type;
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int i;
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if (argc < 4) {
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fprintf(stderr, "Usage: %s <device type> <input file> <output file>\n", argv[0]);
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return -1;
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}
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avdevice_register_all();
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type = av_hwdevice_find_type_by_name(argv[1]);
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if (type == AV_HWDEVICE_TYPE_NONE) {
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fprintf(stderr, "Device type %s is not supported.\n", argv[1]);
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fprintf(stderr, "Available device types:");
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while((type = av_hwdevice_iterate_types(type)) != AV_HWDEVICE_TYPE_NONE)
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fprintf(stderr, " %s", av_hwdevice_get_type_name(type));
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fprintf(stderr, "\n");
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return -1;
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}
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packet = av_packet_alloc();
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if (!packet) {
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fprintf(stderr, "Failed to allocate AVPacket\n");
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return -1;
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}
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/* open the input file */
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const AVInputFormat* input_format = av_find_input_format("v4l2");
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if (avformat_open_input(&input_ctx, argv[2], input_format, NULL) != 0) {
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fprintf(stderr, "Cannot open input file '%s'\n", argv[2]);
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return -1;
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}
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if (avformat_find_stream_info(input_ctx, NULL) < 0) {
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fprintf(stderr, "Cannot find input stream information.\n");
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return -1;
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}
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/* find the video stream information */
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ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
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if (ret < 0) {
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fprintf(stderr, "Cannot find a video stream in the input file\n");
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return -1;
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}
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video_stream = ret;
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for (i = 0;; i++) {
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const AVCodecHWConfig *config = avcodec_get_hw_config(decoder, i);
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if (!config) {
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fprintf(stderr, "Decoder %s does not support device type %s.\n",
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decoder->name, av_hwdevice_get_type_name(type));
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return -1;
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}
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if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX &&
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config->device_type == type) {
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hw_pix_fmt = config->pix_fmt;
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break;
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}
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}
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if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
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return AVERROR(ENOMEM);
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video = input_ctx->streams[video_stream];
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if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0)
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return -1;
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decoder_ctx->get_format = get_hw_format;
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if (hw_decoder_init(decoder_ctx, type) < 0)
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return -1;
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if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) {
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fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream);
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return -1;
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}
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/* open the file to dump raw data */
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output_file = fopen(argv[3], "w+b");
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/* actual decoding and dump the raw data */
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while (ret >= 0) {
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if ((ret = av_read_frame(input_ctx, packet)) < 0)
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break;
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if (video_stream == packet->stream_index)
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ret = decode_write(decoder_ctx, packet);
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av_packet_unref(packet);
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}
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/* flush the decoder */
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ret = decode_write(decoder_ctx, NULL);
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if (output_file)
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fclose(output_file);
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av_packet_free(&packet);
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avcodec_free_context(&decoder_ctx);
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avformat_close_input(&input_ctx);
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av_buffer_unref(&hw_device_ctx);
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return 0;
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}
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