consumer
9th March 2006, 11:46
Well, shortly, I want to rip DVD with DVDx and encode ripped data with ffmpeg. But I dont still understand how transfer ripped frame from DVDx to ffmpeg:
DVDx Ripping function:
MPEG2GetFrameData( FRAME *yuv_frame , int *width,int *height, short int **samples, int *nb_sample )
... returns such ripped frame:
typedef struct {
byte *y;
byte *u;
byte *v;
byte *a;
int id;
double pts;
int sy;
int ey;
} FRAME;
/////////////////
So, that frame, I must tranfer on input to ffmpeg functions:
ffmpeg encoding function:
av_encode(output_files, nb_output_files, input_files, nb_input_files, stream_maps, nb_stream_maps);
inside this function:
...
av_read_frame(is, &pkt)
av_pkt_dump(stdout, &pkt, do_hex_dump);
output_packet(ist, ist_index, ost_table, nb_ostreams, &pkt);
av_free_packet(&pkt);
...
//////////////////
where:
AVFormatContext *is, *os;
AVOutputStream *ost, **ost_table;
AVInputStream *ist, **ist_table;
AVFormatContext *input_files[MAX_FILES];
AVFormatContext *output_files[MAX_FILES];
///////////////////////
typedef struct AVPacket {
int64_t pts; /* presentation time stamp in AV_TIME_BASE units (or
pts_den units in muxers or demuxers) */
int64_t dts; /* decompression time stamp in AV_TIME_BASE units (or
pts_den units in muxers or demuxers) */
uint8_t *data;
int size;
int stream_index;
int flags;
int duration; /* presentation duration (0 if not available) */
void (*destruct)(struct AVPacket *);
void *priv;
} AVPacket;
//////////////////////
typedef struct AVOutputStream {
int file_index; /* file index */
int index; /* stream index in the output file */
int source_index; /* AVInputStream index */
AVStream *st; /* stream in the output file */
int encoding_needed; /* true if encoding needed for this stream */
int frame_number;
/* input pts and corresponding output pts
for A/V sync */
double sync_ipts; /* dts from the AVPacket of the demuxer in second units */
int64_t sync_opts; /* output frame counter, could be changed to some true timestamp */ //FIXME look at frame_number
/* video only */
int video_resample; /* video_resample and video_crop are mutually exclusive */
AVFrame pict_tmp; /* temporary image for resampling */
ImgReSampleContext *img_resample_ctx; /* for image resampling */
int video_crop; /* video_resample and video_crop are mutually exclusive */
int topBand; /* cropping area sizes */
int leftBand;
int video_pad; /* video_resample and video_pad are mutually exclusive */
int padtop; /* padding area sizes */
int padbottom;
int padleft;
int padright;
/* audio only */
int audio_resample;
ReSampleContext *resample; /* for audio resampling */
FifoBuffer fifo; /* for compression: one audio fifo per codec */
FILE *logfile;
} AVOutputStream;
////////////////////////////////////////
typedef struct AVInputStream {
int file_index;
int index;
AVStream *st;
int discard; /* true if stream data should be discarded */
int decoding_needed; /* true if the packets must be decoded in 'raw_fifo' */
int64_t sample_index; /* current sample */
int64_t start; /* time when read started */
unsigned long frame; /* current frame */
int64_t next_pts; /* synthetic pts for cases where pkt.pts
is not defined */
int64_t pts; /* current pts */
int is_start; /* is 1 at the start and after a discontinuity */
} AVInputStream;
/////////////////////////////////////////
typedef struct AVFormatContext {
AVClass *av_class; /* set by av_alloc_format_context */
/* can only be iformat or oformat, not both at the same time */
struct AVInputFormat *iformat;
struct AVOutputFormat *oformat;
void *priv_data;
ByteIOContext pb;
int nb_streams;
AVStream *streams[MAX_STREAMS];
char filename[1024]; /* input or output filename */
/* stream info */
int64_t timestamp;
char title[512];
char author[512];
char copyright[512];
char comment[512];
char album[512];
int year; /* ID3 year, 0 if none */
int track; /* track number, 0 if none */
char genre[32]; /* ID3 genre */
int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
/* private data for pts handling (do not modify directly) */
/* This buffer is only needed when packets were already buffered but
not decoded, for example to get the codec parameters in mpeg
streams */
struct AVPacketList *packet_buffer;
/* decoding: position of the first frame of the component, in
AV_TIME_BASE fractional seconds. NEVER set this value directly:
it is deduced from the AVStream values. */
int64_t start_time;
/* decoding: duration of the stream, in AV_TIME_BASE fractional
seconds. NEVER set this value directly: it is deduced from the
AVStream values. */
int64_t duration;
/* decoding: total file size. 0 if unknown */
int64_t file_size;
/* decoding: total stream bitrate in bit/s, 0 if not
available. Never set it directly if the file_size and the
duration are known as ffmpeg can compute it automatically. */
int bit_rate;
/* av_read_frame() support */
AVStream *cur_st;
const uint8_t *cur_ptr;
int cur_len;
AVPacket cur_pkt;
/* av_seek_frame() support */
int64_t data_offset; /* offset of the first packet */
int index_built;
} AVFormatContext;
/////////////////////////////////////////////////////////////////////////////////////////////
So, I have the frame and I need to transfer it to ffmpeg structures. I must make ffmpeg to work directly with frames to convert video on the fly. Please, help me understand how to do it.
DVDx Ripping function:
MPEG2GetFrameData( FRAME *yuv_frame , int *width,int *height, short int **samples, int *nb_sample )
... returns such ripped frame:
typedef struct {
byte *y;
byte *u;
byte *v;
byte *a;
int id;
double pts;
int sy;
int ey;
} FRAME;
/////////////////
So, that frame, I must tranfer on input to ffmpeg functions:
ffmpeg encoding function:
av_encode(output_files, nb_output_files, input_files, nb_input_files, stream_maps, nb_stream_maps);
inside this function:
...
av_read_frame(is, &pkt)
av_pkt_dump(stdout, &pkt, do_hex_dump);
output_packet(ist, ist_index, ost_table, nb_ostreams, &pkt);
av_free_packet(&pkt);
...
//////////////////
where:
AVFormatContext *is, *os;
AVOutputStream *ost, **ost_table;
AVInputStream *ist, **ist_table;
AVFormatContext *input_files[MAX_FILES];
AVFormatContext *output_files[MAX_FILES];
///////////////////////
typedef struct AVPacket {
int64_t pts; /* presentation time stamp in AV_TIME_BASE units (or
pts_den units in muxers or demuxers) */
int64_t dts; /* decompression time stamp in AV_TIME_BASE units (or
pts_den units in muxers or demuxers) */
uint8_t *data;
int size;
int stream_index;
int flags;
int duration; /* presentation duration (0 if not available) */
void (*destruct)(struct AVPacket *);
void *priv;
} AVPacket;
//////////////////////
typedef struct AVOutputStream {
int file_index; /* file index */
int index; /* stream index in the output file */
int source_index; /* AVInputStream index */
AVStream *st; /* stream in the output file */
int encoding_needed; /* true if encoding needed for this stream */
int frame_number;
/* input pts and corresponding output pts
for A/V sync */
double sync_ipts; /* dts from the AVPacket of the demuxer in second units */
int64_t sync_opts; /* output frame counter, could be changed to some true timestamp */ //FIXME look at frame_number
/* video only */
int video_resample; /* video_resample and video_crop are mutually exclusive */
AVFrame pict_tmp; /* temporary image for resampling */
ImgReSampleContext *img_resample_ctx; /* for image resampling */
int video_crop; /* video_resample and video_crop are mutually exclusive */
int topBand; /* cropping area sizes */
int leftBand;
int video_pad; /* video_resample and video_pad are mutually exclusive */
int padtop; /* padding area sizes */
int padbottom;
int padleft;
int padright;
/* audio only */
int audio_resample;
ReSampleContext *resample; /* for audio resampling */
FifoBuffer fifo; /* for compression: one audio fifo per codec */
FILE *logfile;
} AVOutputStream;
////////////////////////////////////////
typedef struct AVInputStream {
int file_index;
int index;
AVStream *st;
int discard; /* true if stream data should be discarded */
int decoding_needed; /* true if the packets must be decoded in 'raw_fifo' */
int64_t sample_index; /* current sample */
int64_t start; /* time when read started */
unsigned long frame; /* current frame */
int64_t next_pts; /* synthetic pts for cases where pkt.pts
is not defined */
int64_t pts; /* current pts */
int is_start; /* is 1 at the start and after a discontinuity */
} AVInputStream;
/////////////////////////////////////////
typedef struct AVFormatContext {
AVClass *av_class; /* set by av_alloc_format_context */
/* can only be iformat or oformat, not both at the same time */
struct AVInputFormat *iformat;
struct AVOutputFormat *oformat;
void *priv_data;
ByteIOContext pb;
int nb_streams;
AVStream *streams[MAX_STREAMS];
char filename[1024]; /* input or output filename */
/* stream info */
int64_t timestamp;
char title[512];
char author[512];
char copyright[512];
char comment[512];
char album[512];
int year; /* ID3 year, 0 if none */
int track; /* track number, 0 if none */
char genre[32]; /* ID3 genre */
int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
/* private data for pts handling (do not modify directly) */
/* This buffer is only needed when packets were already buffered but
not decoded, for example to get the codec parameters in mpeg
streams */
struct AVPacketList *packet_buffer;
/* decoding: position of the first frame of the component, in
AV_TIME_BASE fractional seconds. NEVER set this value directly:
it is deduced from the AVStream values. */
int64_t start_time;
/* decoding: duration of the stream, in AV_TIME_BASE fractional
seconds. NEVER set this value directly: it is deduced from the
AVStream values. */
int64_t duration;
/* decoding: total file size. 0 if unknown */
int64_t file_size;
/* decoding: total stream bitrate in bit/s, 0 if not
available. Never set it directly if the file_size and the
duration are known as ffmpeg can compute it automatically. */
int bit_rate;
/* av_read_frame() support */
AVStream *cur_st;
const uint8_t *cur_ptr;
int cur_len;
AVPacket cur_pkt;
/* av_seek_frame() support */
int64_t data_offset; /* offset of the first packet */
int index_built;
} AVFormatContext;
/////////////////////////////////////////////////////////////////////////////////////////////
So, I have the frame and I need to transfer it to ffmpeg structures. I must make ffmpeg to work directly with frames to convert video on the fly. Please, help me understand how to do it.