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#include <stdlib.h>
#include <assert.h>
#include <libavformat/avformat.h>
#include "kitchensink/internal/kitdecoder.h"
#include "kitchensink/kiterror.h"
#define BUFFER_IN_SIZE 256
static void free_in_video_packet_cb(void *packet) {
av_packet_free((AVPacket**)&packet);
}
Kit_Decoder* Kit_CreateDecoder(const Kit_Source *src, int stream_index,
int out_b_size, dec_free_packet_cb free_out_cb) {
assert(src != NULL);
assert(out_b_size > 0);
AVCodecContext *codec_ctx = NULL;
AVCodec *codec = NULL;
AVFormatContext *format_ctx = src->format_ctx;
int bsizes[2] = {BUFFER_IN_SIZE, out_b_size};
dec_free_packet_cb free_hooks[2] = {free_in_video_packet_cb, free_out_cb};
// Make sure index seems correct
if(stream_index >= (int)format_ctx->nb_streams || stream_index < 0) {
Kit_SetError("Invalid stream %d", stream_index);
goto exit_0;
}
// Allocate decoder and make sure allocation was a success
Kit_Decoder *dec = calloc(1, sizeof(Kit_Decoder));
if(dec == NULL) {
Kit_SetError("Unable to allocate kit decoder for stream %d", stream_index);
goto exit_0;
}
// Find audio decoder
codec = avcodec_find_decoder(format_ctx->streams[stream_index]->codec->codec_id);
if(!codec) {
Kit_SetError("No suitable decoder found for stream %d", stream_index);
goto exit_1;
}
// Allocate a context for the codec
codec_ctx = avcodec_alloc_context3(codec);
if(avcodec_copy_context(codec_ctx, format_ctx->streams[stream_index]->codec) != 0) {
Kit_SetError("Unable to copy audio codec context for stream %d", stream_index);
goto exit_1;
}
// Open the stream
if(avcodec_open2(codec_ctx, codec, NULL) < 0) {
Kit_SetError("Unable to open codec for stream %d", stream_index);
goto exit_2;
}
// Set index and codec
dec->stream_index = stream_index;
dec->codec_ctx = codec_ctx;
dec->format_ctx = format_ctx;
// Allocate input/output ringbuffers and locks
for(int i = 0; i < 2; i++) {
dec->buffer[i] = Kit_CreateBuffer(bsizes[i], free_hooks[i]);
if(dec->buffer[i] == NULL) {
Kit_SetError("Unable to allocate ringbuffer type %d for stream %d", i, stream_index);
goto exit_3;
}
dec->lock[i] = SDL_CreateMutex();
if(dec->lock[i] == NULL) {
Kit_SetError("Unable to allocate mutex type %d for stream %d", i, stream_index);
goto exit_3;
}
}
// That's that
return dec;
exit_3:
for(int i = 0; i < 2; i++) {
SDL_DestroyMutex(dec->lock[i]);
Kit_DestroyBuffer(dec->buffer[i]);
}
avcodec_close(codec_ctx);
exit_2:
avcodec_free_context(&codec_ctx);
exit_1:
free(dec);
exit_0:
return NULL;
}
void Kit_SetDecoderClockSync(Kit_Decoder *dec, double sync) {
if(dec == NULL) return;
dec->clock_sync = sync;
}
void Kit_ChangeDecoderClockSync(Kit_Decoder *dec, double sync) {
if(dec == NULL) return;
dec->clock_sync += sync;
}
int Kit_WriteDecoderInput(Kit_Decoder *dec, AVPacket *packet) {
assert(dec != NULL);
int ret = 1;
if(SDL_LockMutex(dec->lock[KIT_DEC_IN]) == 0) {
ret = Kit_WriteBuffer(dec->buffer[KIT_DEC_IN], packet);
SDL_UnlockMutex(dec->lock[KIT_DEC_IN]);
}
return ret;
}
bool Kit_CanWriteDecoderInput(Kit_Decoder *dec) {
assert(dec != NULL);
bool ret = false;
if(SDL_LockMutex(dec->lock[KIT_DEC_IN]) == 0) {
ret = !Kit_IsBufferFull(dec->buffer[KIT_DEC_IN]);
SDL_UnlockMutex(dec->lock[KIT_DEC_IN]);
}
return ret;
}
AVPacket* Kit_ReadDecoderInput(Kit_Decoder *dec) {
assert(dec != NULL);
AVPacket *ret = NULL;
if(SDL_LockMutex(dec->lock[KIT_DEC_IN]) == 0) {
ret = Kit_ReadBuffer(dec->buffer[KIT_DEC_IN]);
SDL_UnlockMutex(dec->lock[KIT_DEC_IN]);
}
return ret;
}
int Kit_WriteDecoderOutput(Kit_Decoder *dec, void *packet) {
assert(dec != NULL);
int ret = 1;
if(SDL_LockMutex(dec->lock[KIT_DEC_OUT]) == 0) {
ret = Kit_WriteBuffer(dec->buffer[KIT_DEC_OUT], packet);
SDL_UnlockMutex(dec->lock[KIT_DEC_OUT]);
}
return ret;
}
void Kit_ClearDecoderOutput(Kit_Decoder *dec) {
if(SDL_LockMutex(dec->lock[KIT_DEC_OUT]) == 0) {
Kit_ClearBuffer(dec->buffer[KIT_DEC_OUT]);
SDL_UnlockMutex(dec->lock[KIT_DEC_OUT]);
}
}
void Kit_ClearDecoderInput(Kit_Decoder *dec) {
if(SDL_LockMutex(dec->lock[KIT_DEC_IN]) == 0) {
Kit_ClearBuffer(dec->buffer[KIT_DEC_IN]);
SDL_UnlockMutex(dec->lock[KIT_DEC_IN]);
}
}
void* Kit_PeekDecoderOutput(Kit_Decoder *dec) {
assert(dec != NULL);
void *ret = NULL;
if(SDL_LockMutex(dec->lock[KIT_DEC_OUT]) == 0) {
ret = Kit_PeekBuffer(dec->buffer[KIT_DEC_OUT]);
SDL_UnlockMutex(dec->lock[KIT_DEC_OUT]);
}
return ret;
}
void Kit_ForEachDecoderOutput(Kit_Decoder *dec, Kit_ForEachItemCallback cb, void *userdata) {
assert(dec != NULL);
if(SDL_LockMutex(dec->lock[KIT_DEC_OUT]) == 0) {
Kit_ForEachItemInBuffer(dec->buffer[KIT_DEC_OUT], cb, userdata);
SDL_UnlockMutex(dec->lock[KIT_DEC_OUT]);
}
}
void Kit_AdvanceDecoderOutput(Kit_Decoder *dec) {
assert(dec != NULL);
if(SDL_LockMutex(dec->lock[KIT_DEC_OUT]) == 0) {
Kit_AdvanceBuffer(dec->buffer[KIT_DEC_OUT]);
SDL_UnlockMutex(dec->lock[KIT_DEC_OUT]);
}
}
void Kit_ClearDecoderBuffers(Kit_Decoder *dec) {
if(dec == NULL) return;
Kit_ClearDecoderInput(dec);
Kit_ClearDecoderOutput(dec);
avcodec_flush_buffers(dec->codec_ctx);
}
int Kit_RunDecoder(Kit_Decoder *dec) {
if(dec == NULL) return 0;
AVPacket *in_packet;
int is_output_full = 1;
int ret;
// First, check if there is room in output buffer
if(SDL_LockMutex(dec->lock[KIT_DEC_OUT]) == 0) {
is_output_full = Kit_IsBufferFull(dec->buffer[KIT_DEC_OUT]);
SDL_UnlockMutex(dec->lock[KIT_DEC_OUT]);
}
if(is_output_full) {
return 0;
}
// Then, see if we have incoming data
in_packet = Kit_ReadDecoderInput(dec);
if(in_packet == NULL) {
return 0;
}
// Run decoder with incoming packet
ret = dec->dec_decode(dec, in_packet);
// Free raw packet before returning
av_packet_free(&in_packet);
return ret;
}
void Kit_CloseDecoder(Kit_Decoder *dec) {
if(dec == NULL) return;
if(dec->dec_close) {
dec->dec_close(dec);
}
for(int i = 0; i < 2; i++) {
SDL_DestroyMutex(dec->lock[i]);
Kit_DestroyBuffer(dec->buffer[i]);
}
avcodec_close(dec->codec_ctx);
avcodec_free_context(&dec->codec_ctx);
free(dec);
}
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