From a938be7e5bc16daa1c434d84320968b99747d0c4 Mon Sep 17 00:00:00 2001 From: Steins7 Date: Sun, 22 Sep 2024 17:58:26 +0200 Subject: [PATCH] Get ffmpeg example code to work --- Makefile | 10 +-- src/main.c | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 229 insertions(+), 9 deletions(-) diff --git a/Makefile b/Makefile index f3e4789..433ccd7 100644 --- a/Makefile +++ b/Makefile @@ -1,7 +1,7 @@ # --- minimal linux makefile ------------------------------------------------- # # This makefile works on linux with options to crosscompile by changing the # # TARGET option. By default, compile the defined application for the native # -# platform. # +# platform. # # # # Before use, make sure to adapt the parameters in the following sections # # - project architecture : general folder layout # @@ -30,7 +30,7 @@ C_DEFS= #list all ASM defines here with -D before the name A_DEFS= #list all linker flags here with -l before the name -LDFLAGS= +LDFLAGS=-lavcodec -lavformat -lavutil -lavdevice # --- general settings # RELEASE=0 -> disable optimisation, then enable debug @@ -81,7 +81,7 @@ endif # --- release flag management ifeq ($(strip $(RELEASE)), 0) CFLAGS=-g3 -Os - LDFLAGS=-g3 -Os + LDFLAGS+=-g3 -Os else CFLAGS=-O2 endif @@ -94,7 +94,7 @@ CFLAGS+=$(CPUFLAGS) -std=c23 -Wall -Wextra -Warray-bounds \ ASFLAG=-Wa,--gdwarf2 -D__ASSEMBLY__ $(C_DEFS) $(A_DEFS) #merge all linker options LDFLAGS+=-lc -lgcc -lgcov -lm -Wl,-Map=$@.map,--gc-sections - + # --- folder creation DIR_GUARD=@mkdir -p $(@D) @@ -145,7 +145,7 @@ $(OBJ)/%.o : %.s @printf '\e[1;35m==== compiling [opt=$(opt)] $^ $@ $(LIBRARIES)====\e[0m' @echo $(DIR_GUARD) - $(AS) $(ASFLAGS) $< -o $@ $(LIBRARIES) + $(AS) $(ASFLAGS) $< -o $@ $(LIBRARIES) @$(SKIP_LINE) $(BIN)/%.o : %.s diff --git a/src/main.c b/src/main.c index 35efec3..1ffc721 100644 --- a/src/main.c +++ b/src/main.c @@ -1,8 +1,228 @@ - #include -int main(void) { - printf("hello world\n"); - return 0; +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static AVBufferRef *hw_device_ctx = NULL; +static enum AVPixelFormat hw_pix_fmt; +static FILE *output_file = NULL; + +static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type) +{ + int err = 0; + + if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type, + NULL, NULL, 0)) < 0) { + fprintf(stderr, "Failed to create specified HW device.\n"); + return err; + } + ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); + + return err; +} + +static enum AVPixelFormat get_hw_format(AVCodecContext *ctx, + const enum AVPixelFormat *pix_fmts) +{ + const enum AVPixelFormat *p; + + for (p = pix_fmts; *p != -1; p++) { + if (*p == hw_pix_fmt) + return *p; + } + + fprintf(stderr, "Failed to get HW surface format.\n"); + return AV_PIX_FMT_NONE; +} + +static int decode_write(AVCodecContext *avctx, AVPacket *packet) +{ + AVFrame *frame = NULL, *sw_frame = NULL; + AVFrame *tmp_frame = NULL; + uint8_t *buffer = NULL; + int size; + int ret = 0; + + ret = avcodec_send_packet(avctx, packet); + if (ret < 0) { + fprintf(stderr, "Error during decoding\n"); + return ret; + } + + while (1) { + if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) { + fprintf(stderr, "Can not alloc frame\n"); + ret = AVERROR(ENOMEM); + goto fail; + } + + ret = avcodec_receive_frame(avctx, frame); + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) { + av_frame_free(&frame); + av_frame_free(&sw_frame); + return 0; + } else if (ret < 0) { + fprintf(stderr, "Error while decoding\n"); + goto fail; + } + + if (frame->format == hw_pix_fmt) { + /* retrieve data from GPU to CPU */ + if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) { + fprintf(stderr, "Error transferring the data to system memory\n"); + goto fail; + } + tmp_frame = sw_frame; + } else + tmp_frame = frame; + + size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width, + tmp_frame->height, 1); + buffer = av_malloc(size); + if (!buffer) { + fprintf(stderr, "Can not alloc buffer\n"); + ret = AVERROR(ENOMEM); + goto fail; + } + ret = av_image_copy_to_buffer(buffer, size, + (const uint8_t * const *)tmp_frame->data, + (const int *)tmp_frame->linesize, tmp_frame->format, + tmp_frame->width, tmp_frame->height, 1); + if (ret < 0) { + fprintf(stderr, "Can not copy image to buffer\n"); + goto fail; + } + + if ((ret = fwrite(buffer, 1, size, output_file)) < 0) { + fprintf(stderr, "Failed to dump raw data.\n"); + goto fail; + } + + fail: + av_frame_free(&frame); + av_frame_free(&sw_frame); + av_freep(&buffer); + if (ret < 0) + return ret; + } +} + +int main(int argc, char *argv[]) +{ + AVFormatContext *input_ctx = NULL; + int video_stream, ret; + AVStream *video = NULL; + AVCodecContext *decoder_ctx = NULL; + const AVCodec *decoder = NULL; + AVPacket *packet = NULL; + enum AVHWDeviceType type; + int i; + + if (argc < 4) { + fprintf(stderr, "Usage: %s \n", argv[0]); + return -1; + } + + avdevice_register_all(); + + type = av_hwdevice_find_type_by_name(argv[1]); + if (type == AV_HWDEVICE_TYPE_NONE) { + fprintf(stderr, "Device type %s is not supported.\n", argv[1]); + fprintf(stderr, "Available device types:"); + while((type = av_hwdevice_iterate_types(type)) != AV_HWDEVICE_TYPE_NONE) + fprintf(stderr, " %s", av_hwdevice_get_type_name(type)); + fprintf(stderr, "\n"); + return -1; + } + + packet = av_packet_alloc(); + if (!packet) { + fprintf(stderr, "Failed to allocate AVPacket\n"); + return -1; + } + + /* open the input file */ + const AVInputFormat* input_format = av_find_input_format("v4l2"); + if (avformat_open_input(&input_ctx, argv[2], input_format, NULL) != 0) { + fprintf(stderr, "Cannot open input file '%s'\n", argv[2]); + return -1; + } + + if (avformat_find_stream_info(input_ctx, NULL) < 0) { + fprintf(stderr, "Cannot find input stream information.\n"); + return -1; + } + + /* find the video stream information */ + ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0); + if (ret < 0) { + fprintf(stderr, "Cannot find a video stream in the input file\n"); + return -1; + } + video_stream = ret; + + for (i = 0;; i++) { + const AVCodecHWConfig *config = avcodec_get_hw_config(decoder, i); + if (!config) { + fprintf(stderr, "Decoder %s does not support device type %s.\n", + decoder->name, av_hwdevice_get_type_name(type)); + return -1; + } + if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX && + config->device_type == type) { + hw_pix_fmt = config->pix_fmt; + break; + } + } + + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) + return AVERROR(ENOMEM); + + video = input_ctx->streams[video_stream]; + if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0) + return -1; + + decoder_ctx->get_format = get_hw_format; + + if (hw_decoder_init(decoder_ctx, type) < 0) + return -1; + + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) { + fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream); + return -1; + } + + /* open the file to dump raw data */ + output_file = fopen(argv[3], "w+b"); + + /* actual decoding and dump the raw data */ + while (ret >= 0) { + if ((ret = av_read_frame(input_ctx, packet)) < 0) + break; + + if (video_stream == packet->stream_index) + ret = decode_write(decoder_ctx, packet); + + av_packet_unref(packet); + } + + /* flush the decoder */ + ret = decode_write(decoder_ctx, NULL); + + if (output_file) + fclose(output_file); + av_packet_free(&packet); + avcodec_free_context(&decoder_ctx); + avformat_close_input(&input_ctx); + av_buffer_unref(&hw_device_ctx); + + return 0; }