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267 lines
7.6 KiB
C
267 lines
7.6 KiB
C
#include "decoder.h"
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#include <libavformat/avformat.h>
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#include <libavutil/time.h>
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#include <SDL2/SDL_events.h>
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#include <SDL2/SDL_mutex.h>
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#include <SDL2/SDL_thread.h>
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#include <unistd.h>
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#include "config.h"
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#include "events.h"
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#include "frames.h"
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#include "lock_util.h"
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#include "log.h"
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#define BUFSIZE 0x10000
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static AVRational us = {1, 1000000};
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static inline uint64_t from_be(uint8_t *b, int size)
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{
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uint64_t x = 0;
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int i;
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for (i = 0; i < size; i += 1) {
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x <<= 8;
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x |= b[i];
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}
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return x;
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}
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#define HEADER_SIZE 16
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static int read_packet(void *opaque, uint8_t *buf, int buf_size) {
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struct decoder *decoder = opaque;
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uint8_t header[HEADER_SIZE];
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int remaining;
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int ret;
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remaining = decoder->remaining;
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if (remaining == 0) {
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ret = net_recv(decoder->video_socket, header, HEADER_SIZE);
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if (ret <= 0)
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return ret;
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decoder->pts = from_be(header, 8);
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remaining = from_be(header + 12, 4);
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}
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if (buf_size > remaining)
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buf_size = remaining;
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ret = net_recv(decoder->video_socket, buf, buf_size);
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if (ret <= 0)
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return ret;
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remaining -= ret;
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decoder->remaining = remaining;
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return ret;
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}
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// set the decoded frame as ready for rendering, and notify
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static void push_frame(struct decoder *decoder) {
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SDL_bool previous_frame_consumed = frames_offer_decoded_frame(decoder->frames);
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if (!previous_frame_consumed) {
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// the previous EVENT_NEW_FRAME will consume this frame
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return;
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}
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static SDL_Event new_frame_event = {
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.type = EVENT_NEW_FRAME,
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};
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SDL_PushEvent(&new_frame_event);
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}
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static void notify_stopped(void) {
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SDL_Event stop_event;
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stop_event.type = EVENT_DECODER_STOPPED;
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SDL_PushEvent(&stop_event);
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}
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static int run_decoder(void *data) {
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struct decoder *decoder = data;
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int ret;
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AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_H264);
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if (!codec) {
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LOGE("H.264 decoder not found");
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goto run_end;
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}
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AVCodecContext *codec_ctx = avcodec_alloc_context3(codec);
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if (!codec_ctx) {
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LOGC("Could not allocate decoder context");
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goto run_end;
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}
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if (avcodec_open2(codec_ctx, codec, NULL) < 0) {
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LOGE("Could not open H.264 codec");
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goto run_finally_free_codec_ctx;
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}
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AVFormatContext *format_ctx = avformat_alloc_context();
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if (!format_ctx) {
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LOGC("Could not allocate format context");
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goto run_finally_close_codec;
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}
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unsigned char *buffer = av_malloc(BUFSIZE);
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if (!buffer) {
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LOGC("Could not allocate buffer");
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goto run_finally_free_format_ctx;
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}
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AVIOContext *avio_ctx = avio_alloc_context(buffer, BUFSIZE, 0, decoder, read_packet, NULL, NULL);
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if (!avio_ctx) {
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LOGC("Could not allocate avio context");
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// avformat_open_input takes ownership of 'buffer'
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// so only free the buffer before avformat_open_input()
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av_free(buffer);
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goto run_finally_free_format_ctx;
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}
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format_ctx->pb = avio_ctx;
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if (avformat_open_input(&format_ctx, NULL, NULL, NULL) < 0) {
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LOGE("Could not open video stream");
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goto run_finally_free_avio_ctx;
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}
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AVStream *outstream = NULL;
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AVFormatContext *output_ctx = NULL;
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if (decoder->out_filename) {
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avformat_alloc_output_context2(&output_ctx, NULL, NULL, decoder->out_filename);
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if (!output_ctx) {
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LOGE("Could not allocate output format context");
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goto run_finally_free_avio_ctx;
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} else {
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outstream = avformat_new_stream(output_ctx, codec);
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if (!outstream) {
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LOGE("Could not allocate output stream");
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goto run_finally_free_output_ctx;
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}
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outstream->codec = avcodec_alloc_context3(codec);
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outstream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
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outstream->codec->width = decoder->frame_size.width;
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outstream->codec->height = decoder->frame_size.height;
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outstream->time_base = (AVRational) {1, 60};
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outstream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
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ret = avio_open(&output_ctx->pb, decoder->out_filename, AVIO_FLAG_WRITE);
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if (ret < 0) {
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LOGE("Failed to open output file");
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goto run_finally_free_output_ctx;
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}
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ret = avformat_write_header(output_ctx, NULL);
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if (ret < 0) {
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LOGE("Error writing output header");
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avio_closep(&output_ctx->pb);
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goto run_finally_free_output_ctx;
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}
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}
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}
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AVPacket packet;
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av_init_packet(&packet);
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packet.data = NULL;
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packet.size = 0;
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while (!av_read_frame(format_ctx, &packet)) {
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if (output_ctx) {
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packet.pts = decoder->pts;
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av_packet_rescale_ts(&packet, us, outstream->time_base);
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ret = av_write_frame(output_ctx, &packet);
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}
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// the new decoding/encoding API has been introduced by:
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// <http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=7fc329e2dd6226dfecaa4a1d7adf353bf2773726>
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#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 37, 0)
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if ((ret = avcodec_send_packet(codec_ctx, &packet)) < 0) {
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LOGE("Could not send video packet: %d", ret);
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goto run_quit;
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}
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ret = avcodec_receive_frame(codec_ctx, decoder->frames->decoding_frame);
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if (!ret) {
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// a frame was received
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push_frame(decoder);
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} else if (ret != AVERROR(EAGAIN)) {
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LOGE("Could not receive video frame: %d", ret);
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av_packet_unref(&packet);
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goto run_quit;
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}
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#else
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while (packet.size > 0) {
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int got_picture;
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int len = avcodec_decode_video2(codec_ctx, decoder->frames->decoding_frame, &got_picture, &packet);
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if (len < 0) {
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LOGE("Could not decode video packet: %d", len);
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av_packet_unref(&packet);
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goto run_quit;
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}
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if (got_picture) {
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push_frame(decoder);
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}
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packet.size -= len;
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packet.data += len;
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}
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#endif
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av_packet_unref(&packet);
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if (avio_ctx->eof_reached) {
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break;
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}
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}
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LOGD("End of frames");
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run_quit:
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if (output_ctx) {
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ret = av_write_trailer(output_ctx);
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avio_closep(&output_ctx->pb);
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}
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avformat_close_input(&format_ctx);
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run_finally_free_output_ctx:
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if (output_ctx)
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avformat_free_context(output_ctx);
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run_finally_free_avio_ctx:
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av_freep(&avio_ctx);
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run_finally_free_format_ctx:
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avformat_free_context(format_ctx);
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run_finally_close_codec:
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avcodec_close(codec_ctx);
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run_finally_free_codec_ctx:
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avcodec_free_context(&codec_ctx);
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notify_stopped();
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run_end:
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return 0;
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}
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void decoder_init(struct decoder *decoder, struct frames *frames, socket_t video_socket, struct size frame_size) {
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decoder->frames = frames;
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decoder->video_socket = video_socket;
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decoder->frame_size = frame_size;
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}
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SDL_bool decoder_start(struct decoder *decoder, const char *out_filename) {
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LOGD("Starting decoder thread");
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decoder->out_filename = out_filename;
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decoder->thread = SDL_CreateThread(run_decoder, "video_decoder", decoder);
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if (!decoder->thread) {
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LOGC("Could not start decoder thread");
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return SDL_FALSE;
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}
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return SDL_TRUE;
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}
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void decoder_stop(struct decoder *decoder) {
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frames_stop(decoder->frames);
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}
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void decoder_join(struct decoder *decoder) {
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SDL_WaitThread(decoder->thread, NULL);
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}
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