#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
+#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avstring.h"
#include "libavutil/libm.h"
const int program_birth_year = 2000;
/* select an input stream for an output stream */
-typedef struct AVStreamMap {
+typedef struct StreamMap {
int file_index;
int stream_index;
int sync_file_index;
int sync_stream_index;
-} AVStreamMap;
+} StreamMap;
/**
* select an input file for an output file
*/
-typedef struct AVMetaDataMap {
+typedef struct MetadataMap {
int file; //< file index
char type; //< type of metadata to copy -- (g)lobal, (s)tream, (c)hapter or (p)rogram
int index; //< stream/chapter/program number
-} AVMetaDataMap;
+} MetadataMap;
-typedef struct AVChapterMap {
+typedef struct ChapterMap {
int in_file;
int out_file;
-} AVChapterMap;
+} ChapterMap;
static const OptionDef options[];
#define FFM_PACKET_SIZE 4096 //XXX a duplicate of the line in ffm.h
static const char *last_asked_format = NULL;
-static int64_t input_files_ts_offset[MAX_FILES];
static double *input_files_ts_scale[MAX_FILES] = {NULL};
-static AVCodec **input_codecs = NULL;
-static int nb_input_codecs = 0;
static int nb_input_files_ts_scale[MAX_FILES] = {0};
static AVFormatContext *output_files[MAX_FILES];
static AVDictionary *output_opts[MAX_FILES];
static int nb_output_files = 0;
-static AVStreamMap *stream_maps = NULL;
+static StreamMap *stream_maps = NULL;
static int nb_stream_maps;
/* first item specifies output metadata, second is input */
-static AVMetaDataMap (*meta_data_maps)[2] = NULL;
+static MetadataMap (*meta_data_maps)[2] = NULL;
static int nb_meta_data_maps;
static int metadata_global_autocopy = 1;
static int metadata_streams_autocopy = 1;
static int metadata_chapters_autocopy = 1;
-static AVChapterMap *chapter_maps = NULL;
+static ChapterMap *chapter_maps = NULL;
static int nb_chapter_maps;
/* indexed by output file stream index */
#define DEFAULT_PASS_LOGFILENAME_PREFIX "ffmpeg2pass"
-struct AVInputStream;
+struct InputStream;
-typedef struct AVOutputStream {
+typedef struct OutputStream {
int file_index; /* file index */
int index; /* stream index in the output file */
- int source_index; /* AVInputStream index */
+ int source_index; /* InputStream 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 */
- struct AVInputStream *sync_ist; /* input stream to sync against */
+ struct InputStream *sync_ist; /* input stream to sync against */
int64_t sync_opts; /* output frame counter, could be changed to some true timestamp */ //FIXME look at frame_number
AVBitStreamFilterContext *bitstream_filters;
AVCodec *enc;
#endif
int sws_flags;
-} AVOutputStream;
+} OutputStream;
-static AVOutputStream **output_streams_for_file[MAX_FILES] = { NULL };
+static OutputStream **output_streams_for_file[MAX_FILES] = { NULL };
static int nb_output_streams_for_file[MAX_FILES] = { 0 };
-typedef struct AVInputStream {
+typedef struct InputStream {
int file_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 */
+ AVCodec *dec;
int64_t start; /* time when read started */
int64_t next_pts; /* synthetic pts for cases where pkt.pts
int is_start; /* is 1 at the start and after a discontinuity */
int showed_multi_packet_warning;
int is_past_recording_time;
-#if CONFIG_AVFILTER
- AVFrame *filter_frame;
- int has_filter_frame;
-#endif
-} AVInputStream;
+} InputStream;
-typedef struct AVInputFile {
+typedef struct InputFile {
AVFormatContext *ctx;
int eof_reached; /* true if eof reached */
int ist_index; /* index of first stream in ist_table */
int buffer_size; /* current total buffer size */
-} AVInputFile;
+ int64_t ts_offset;
+} InputFile;
-static AVInputStream *input_streams = NULL;
+static InputStream *input_streams = NULL;
static int nb_input_streams = 0;
-static AVInputFile *input_files = NULL;
+static InputFile *input_files = NULL;
static int nb_input_files = 0;
#if CONFIG_AVFILTER
-static int configure_video_filters(AVInputStream *ist, AVOutputStream *ost)
+static int configure_video_filters(InputStream *ist, OutputStream *ost)
{
AVFilterContext *last_filter, *filter;
/** filter graph containing all filters including input & output */
av_free(vstats_filename);
av_free(streamid_map);
- av_free(input_codecs);
av_free(stream_maps);
av_free(meta_data_maps);
}
}
-static AVOutputStream *new_output_stream(AVFormatContext *oc, int file_idx)
+static OutputStream *new_output_stream(AVFormatContext *oc, int file_idx)
{
int idx = oc->nb_streams - 1;
- AVOutputStream *ost;
+ OutputStream *ost;
output_streams_for_file[file_idx] =
grow_array(output_streams_for_file[file_idx],
&nb_output_streams_for_file[file_idx],
oc->nb_streams);
ost = output_streams_for_file[file_idx][idx] =
- av_mallocz(sizeof(AVOutputStream));
+ av_mallocz(sizeof(OutputStream));
if (!ost) {
fprintf(stderr, "Could not alloc output stream\n");
ffmpeg_exit(1);
}
static double
-get_sync_ipts(const AVOutputStream *ost)
+get_sync_ipts(const OutputStream *ost)
{
- const AVInputStream *ist = ost->sync_ist;
+ const InputStream *ist = ost->sync_ist;
return (double)(ist->pts - start_time)/AV_TIME_BASE;
}
#define MAX_AUDIO_PACKET_SIZE (128 * 1024)
static void do_audio_out(AVFormatContext *s,
- AVOutputStream *ost,
- AVInputStream *ist,
+ OutputStream *ost,
+ InputStream *ist,
unsigned char *buf, int size)
{
uint8_t *buftmp;
int size_out, frame_bytes, ret, resample_changed;
AVCodecContext *enc= ost->st->codec;
AVCodecContext *dec= ist->st->codec;
- int osize= av_get_bits_per_sample_fmt(enc->sample_fmt)/8;
- int isize= av_get_bits_per_sample_fmt(dec->sample_fmt)/8;
+ int osize = av_get_bytes_per_sample(enc->sample_fmt);
+ int isize = av_get_bytes_per_sample(dec->sample_fmt);
const int coded_bps = av_get_bits_per_sample(enc->codec->id);
need_realloc:
}
}
-static void pre_process_video_frame(AVInputStream *ist, AVPicture *picture, void **bufp)
+static void pre_process_video_frame(InputStream *ist, AVPicture *picture, void **bufp)
{
AVCodecContext *dec;
AVPicture *picture2;
#define AV_DELAY_MAX 0.100
static void do_subtitle_out(AVFormatContext *s,
- AVOutputStream *ost,
- AVInputStream *ist,
+ OutputStream *ost,
+ InputStream *ist,
AVSubtitle *sub,
int64_t pts)
{
static uint8_t *bit_buffer= NULL;
static void do_video_out(AVFormatContext *s,
- AVOutputStream *ost,
- AVInputStream *ist,
+ OutputStream *ost,
+ InputStream *ist,
AVFrame *in_picture,
- int *frame_size)
+ int *frame_size, float quality)
{
int nb_frames, i, ret, resample_changed;
AVFrame *final_picture, *formatted_picture;
/* handles sameq here. This is not correct because it may
not be a global option */
- big_picture.quality = same_quality ? ist->st->quality : ost->st->quality;
+ big_picture.quality = quality;
if(!me_threshold)
big_picture.pict_type = 0;
// big_picture.pts = AV_NOPTS_VALUE;
return -10.0*log(d)/log(10.0);
}
-static void do_video_stats(AVFormatContext *os, AVOutputStream *ost,
+static void do_video_stats(AVFormatContext *os, OutputStream *ost,
int frame_size)
{
AVCodecContext *enc;
}
static void print_report(AVFormatContext **output_files,
- AVOutputStream **ost_table, int nb_ostreams,
+ OutputStream **ost_table, int nb_ostreams,
int is_last_report)
{
char buf[1024];
- AVOutputStream *ost;
+ OutputStream *ost;
AVFormatContext *oc;
int64_t total_size;
AVCodecContext *enc;
}
/* pkt = NULL means EOF (needed to flush decoder buffers) */
-static int output_packet(AVInputStream *ist, int ist_index,
- AVOutputStream **ost_table, int nb_ostreams,
+static int output_packet(InputStream *ist, int ist_index,
+ OutputStream **ost_table, int nb_ostreams,
const AVPacket *pkt)
{
AVFormatContext *os;
- AVOutputStream *ost;
+ OutputStream *ost;
int ret, i;
int got_output;
AVFrame picture;
#if CONFIG_AVFILTER
int frame_available;
#endif
+ float quality;
AVPacket avpkt;
- int bps = av_get_bits_per_sample_fmt(ist->st->codec->sample_fmt)>>3;
+ int bps = av_get_bytes_per_sample(ist->st->codec->sample_fmt);
if(ist->next_pts == AV_NOPTS_VALUE)
ist->next_pts= ist->pts;
ret = avcodec_decode_video2(ist->st->codec,
&picture, &got_output, &avpkt);
- ist->st->quality= picture.quality;
+ quality = same_quality ? picture.quality : 0;
if (ret < 0)
goto fail_decode;
if (!got_output) {
os = output_files[ost->file_index];
/* set the input output pts pairs */
- //ost->sync_ipts = (double)(ist->pts + input_files_ts_offset[ist->file_index] - start_time)/ AV_TIME_BASE;
+ //ost->sync_ipts = (double)(ist->pts + input_files[ist->file_index].ts_offset - start_time)/ AV_TIME_BASE;
if (ost->encoding_needed) {
av_assert0(ist->decoding_needed);
if (ost->picref->video && !ost->frame_aspect_ratio)
ost->st->codec->sample_aspect_ratio = ost->picref->video->pixel_aspect;
#endif
- do_video_out(os, ost, ist, &picture, &frame_size);
+ do_video_out(os, ost, ist, &picture, &frame_size,
+ same_quality ? quality : ost->st->codec->global_quality);
if (vstats_filename && frame_size)
do_video_stats(os, ost, frame_size);
break;
ret = 0;
/* encode any samples remaining in fifo */
if (fifo_bytes > 0) {
- int osize = av_get_bits_per_sample_fmt(enc->sample_fmt) >> 3;
+ int osize = av_get_bytes_per_sample(enc->sample_fmt);
int fs_tmp = enc->frame_size;
av_fifo_generic_read(ost->fifo, audio_buf, fifo_bytes, NULL);
for (i = 0; i < is->nb_chapters; i++) {
AVChapter *in_ch = is->chapters[i], *out_ch;
- int64_t ts_off = av_rescale_q(start_time - input_files_ts_offset[infile],
+ int64_t ts_off = av_rescale_q(start_time - input_files[infile].ts_offset,
AV_TIME_BASE_Q, in_ch->time_base);
int64_t rt = (recording_time == INT64_MAX) ? INT64_MAX :
av_rescale_q(recording_time, AV_TIME_BASE_Q, in_ch->time_base);
return 0;
}
-static void parse_forced_key_frames(char *kf, AVOutputStream *ost,
+static void parse_forced_key_frames(char *kf, OutputStream *ost,
AVCodecContext *avctx)
{
char *p;
*/
static int transcode(AVFormatContext **output_files,
int nb_output_files,
- AVInputFile *input_files,
+ InputFile *input_files,
int nb_input_files,
- AVStreamMap *stream_maps, int nb_stream_maps)
+ StreamMap *stream_maps, int nb_stream_maps)
{
int ret = 0, i, j, k, n, nb_ostreams = 0;
AVFormatContext *is, *os;
AVCodecContext *codec, *icodec;
- AVOutputStream *ost, **ost_table = NULL;
- AVInputStream *ist;
+ OutputStream *ost, **ost_table = NULL;
+ InputStream *ist;
char error[1024];
int want_sdp = 1;
uint8_t no_packet[MAX_FILES]={0};
}
}
- ost_table = av_mallocz(sizeof(AVOutputStream *) * nb_ostreams);
+ ost_table = av_mallocz(sizeof(OutputStream *) * nb_ostreams);
if (!ost_table)
goto fail;
n = 0;
for (i = 0; i < nb_input_streams; i++) {
ist = &input_streams[i];
if (ist->decoding_needed) {
- AVCodec *codec = i < nb_input_codecs ? input_codecs[i] : NULL;
+ AVCodec *codec = ist->dec;
if (!codec)
codec = avcodec_find_decoder(ist->st->codec->codec_id);
if (!codec) {
files[1] = input_files[in_file_index].ctx;
for (j = 0; j < 2; j++) {
- AVMetaDataMap *map = &meta_data_maps[i][j];
+ MetadataMap *map = &meta_data_maps[i][j];
switch (map->type) {
case 'g':
goto discard_packet;
if (pkt.dts != AV_NOPTS_VALUE)
- pkt.dts += av_rescale_q(input_files_ts_offset[ist->file_index], AV_TIME_BASE_Q, ist->st->time_base);
+ pkt.dts += av_rescale_q(input_files[ist->file_index].ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
if (pkt.pts != AV_NOPTS_VALUE)
- pkt.pts += av_rescale_q(input_files_ts_offset[ist->file_index], AV_TIME_BASE_Q, ist->st->time_base);
+ pkt.pts += av_rescale_q(input_files[ist->file_index].ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
if (pkt.stream_index < nb_input_files_ts_scale[file_index]
&& input_files_ts_scale[file_index][pkt.stream_index]){
pkt.dts *= input_files_ts_scale[file_index][pkt.stream_index];
}
-// fprintf(stderr, "next:%"PRId64" dts:%"PRId64" off:%"PRId64" %d\n", ist->next_pts, pkt.dts, input_files_ts_offset[ist->file_index], ist->st->codec->codec_type);
+// fprintf(stderr, "next:%"PRId64" dts:%"PRId64" off:%"PRId64" %d\n", ist->next_pts, pkt.dts, input_files[ist->file_index].ts_offset, ist->st->codec->codec_type);
if (pkt.dts != AV_NOPTS_VALUE && ist->next_pts != AV_NOPTS_VALUE
&& (is->iformat->flags & AVFMT_TS_DISCONT)) {
int64_t pkt_dts= av_rescale_q(pkt.dts, ist->st->time_base, AV_TIME_BASE_Q);
int64_t delta= pkt_dts - ist->next_pts;
if((FFABS(delta) > 1LL*dts_delta_threshold*AV_TIME_BASE || pkt_dts+1<ist->pts)&& !copy_ts){
- input_files_ts_offset[ist->file_index]-= delta;
+ input_files[ist->file_index].ts_offset -= delta;
if (verbose > 2)
- fprintf(stderr, "timestamp discontinuity %"PRId64", new offset= %"PRId64"\n", delta, input_files_ts_offset[ist->file_index]);
+ fprintf(stderr, "timestamp discontinuity %"PRId64", new offset= %"PRId64"\n",
+ delta, input_files[ist->file_index].ts_offset);
pkt.dts-= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
if(pkt.pts != AV_NOPTS_VALUE)
pkt.pts-= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
static int opt_map(const char *opt, const char *arg)
{
- AVStreamMap *m;
+ StreamMap *m;
char *p;
stream_maps = grow_array(stream_maps, sizeof(*stream_maps), &nb_stream_maps, nb_stream_maps + 1);
static int opt_map_metadata(const char *opt, const char *arg)
{
- AVMetaDataMap *m, *m1;
+ MetadataMap *m, *m1;
char *p;
meta_data_maps = grow_array(meta_data_maps, sizeof(*meta_data_maps),
static int opt_map_chapters(const char *opt, const char *arg)
{
- AVChapterMap *c;
+ ChapterMap *c;
char *p;
chapter_maps = grow_array(chapter_maps, sizeof(*chapter_maps), &nb_chapter_maps,
opt_programid=0;
}
- ic->loop_input = loop_input;
+ if (loop_input) {
+ av_log(NULL, AV_LOG_WARNING, "-loop_input is deprecated, use -loop 1\n");
+ ic->loop_input = loop_input;
+ }
/* Set AVCodecContext options so they will be seen by av_find_stream_info() */
for (i = 0; i < ic->nb_streams; i++) {
for(i=0;i<ic->nb_streams;i++) {
AVStream *st = ic->streams[i];
AVCodecContext *dec = st->codec;
- AVInputStream *ist;
+ InputStream *ist;
dec->thread_count = thread_count;
- input_codecs = grow_array(input_codecs, sizeof(*input_codecs), &nb_input_codecs, nb_input_codecs + 1);
input_streams = grow_array(input_streams, sizeof(*input_streams), &nb_input_streams, nb_input_streams + 1);
ist = &input_streams[nb_input_streams - 1];
switch (dec->codec_type) {
case AVMEDIA_TYPE_AUDIO:
- input_codecs[nb_input_codecs-1] = avcodec_find_decoder_by_name(audio_codec_name);
- set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_AUDIO], AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM, input_codecs[nb_input_codecs-1]);
+ ist->dec = avcodec_find_decoder_by_name(audio_codec_name);
+ set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_AUDIO], AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM, ist->dec);
channel_layout = dec->channel_layout;
audio_sample_fmt = dec->sample_fmt;
if(audio_disable)
st->discard= AVDISCARD_ALL;
break;
case AVMEDIA_TYPE_VIDEO:
- input_codecs[nb_input_codecs-1] = avcodec_find_decoder_by_name(video_codec_name);
- set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_VIDEO], AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM, input_codecs[nb_input_codecs-1]);
+ ist->dec = avcodec_find_decoder_by_name(video_codec_name);
+ set_context_opts(dec, avcodec_opts[AVMEDIA_TYPE_VIDEO], AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM, ist->dec);
rfps = ic->streams[i]->r_frame_rate.num;
rfps_base = ic->streams[i]->r_frame_rate.den;
if (dec->lowres) {
case AVMEDIA_TYPE_DATA:
break;
case AVMEDIA_TYPE_SUBTITLE:
- input_codecs[nb_input_codecs-1] = avcodec_find_decoder_by_name(subtitle_codec_name);
+ ist->dec = avcodec_find_decoder_by_name(subtitle_codec_name);
if(subtitle_disable)
st->discard = AVDISCARD_ALL;
break;
}
}
- input_files_ts_offset[nb_input_files] = input_ts_offset - (copy_ts ? 0 : timestamp);
/* dump the file content */
if (verbose >= 0)
av_dump_format(ic, nb_input_files, filename, 0);
input_files = grow_array(input_files, sizeof(*input_files), &nb_input_files, nb_input_files + 1);
input_files[nb_input_files - 1].ctx = ic;
input_files[nb_input_files - 1].ist_index = nb_input_streams - ic->nb_streams;
+ input_files[nb_input_files - 1].ts_offset = input_ts_offset - (copy_ts ? 0 : timestamp);
frame_rate = (AVRational){0, 0};
frame_pix_fmt = PIX_FMT_NONE;
static void new_video_stream(AVFormatContext *oc, int file_idx)
{
AVStream *st;
- AVOutputStream *ost;
+ OutputStream *ost;
AVCodecContext *video_enc;
enum CodecID codec_id = CODEC_ID_NONE;
AVCodec *codec= NULL;
video_enc->gop_size = 0;
if (video_qscale || same_quality) {
video_enc->flags |= CODEC_FLAG_QSCALE;
- video_enc->global_quality=
- st->quality = FF_QP2LAMBDA * video_qscale;
+ video_enc->global_quality = FF_QP2LAMBDA * video_qscale;
}
if(intra_matrix)
static void new_audio_stream(AVFormatContext *oc, int file_idx)
{
AVStream *st;
- AVOutputStream *ost;
+ OutputStream *ost;
AVCodec *codec= NULL;
AVCodecContext *audio_enc;
enum CodecID codec_id = CODEC_ID_NONE;
if (audio_qscale > QSCALE_NONE) {
audio_enc->flags |= CODEC_FLAG_QSCALE;
- audio_enc->global_quality = st->quality = FF_QP2LAMBDA * audio_qscale;
+ audio_enc->global_quality = FF_QP2LAMBDA * audio_qscale;
}
if (audio_channels)
audio_enc->channels = audio_channels;
static void new_subtitle_stream(AVFormatContext *oc, int file_idx)
{
AVStream *st;
- AVOutputStream *ost;
+ OutputStream *ost;
AVCodec *codec=NULL;
AVCodecContext *subtitle_enc;
enum CodecID codec_id = CODEC_ID_NONE;
use_subtitle = file_oformat->subtitle_codec != CODEC_ID_NONE || subtitle_stream_copy || subtitle_codec_name;
use_data = data_stream_copy || data_codec_name; /* XXX once generic data codec will be available add a ->data_codec reference and use it here */
- /* disable if no corresponding type found and at least one
- input file */
- if (nb_input_files > 0) {
- check_inputs(&input_has_video,
- &input_has_audio,
- &input_has_subtitle,
- &input_has_data);
-
- if (!input_has_video)
- use_video = 0;
- if (!input_has_audio)
- use_audio = 0;
- if (!input_has_subtitle)
- use_subtitle = 0;
- if (!input_has_data)
- use_data = 0;
- }
+ /* disable if no corresponding type found */
+ check_inputs(&input_has_video,
+ &input_has_audio,
+ &input_has_subtitle,
+ &input_has_data);
+
+ if (!input_has_video)
+ use_video = 0;
+ if (!input_has_audio)
+ use_audio = 0;
+ if (!input_has_subtitle)
+ use_subtitle = 0;
+ if (!input_has_data)
+ use_data = 0;
/* manual disable */
if (audio_disable) use_audio = 0;
oc->preload= (int)(mux_preload*AV_TIME_BASE);
oc->max_delay= (int)(mux_max_delay*AV_TIME_BASE);
- oc->loop_output = loop_output;
+ if (loop_output >= 0) {
+ av_log(NULL, AV_LOG_WARNING, "-loop_output is deprecated, use -loop\n");
+ oc->loop_output = loop_output;
+ }
oc->flags |= AVFMT_FLAG_NONBLOCK;
frame_rate = (AVRational){0, 0};
{ "hex", OPT_BOOL | OPT_EXPERT, {(void*)&do_hex_dump},
"when dumping packets, also dump the payload" },
{ "re", OPT_BOOL | OPT_EXPERT, {(void*)&rate_emu}, "read input at native frame rate", "" },
- { "loop_input", OPT_BOOL | OPT_EXPERT, {(void*)&loop_input}, "loop (current only works with images)" },
- { "loop_output", HAS_ARG | OPT_INT | OPT_EXPERT, {(void*)&loop_output}, "number of times to loop output in formats that support looping (0 loops forever)", "" },
+ { "loop_input", OPT_BOOL | OPT_EXPERT, {(void*)&loop_input}, "deprecated, use -loop" },
+ { "loop_output", HAS_ARG | OPT_INT | OPT_EXPERT, {(void*)&loop_output}, "deprecated, use -loop", "" },
{ "v", HAS_ARG, {(void*)opt_verbose}, "set ffmpeg verbosity level", "number" },
{ "target", HAS_ARG, {(void*)opt_target}, "specify target file type (\"vcd\", \"svcd\", \"dvd\", \"dv\", \"dv50\", \"pal-vcd\", \"ntsc-svcd\", ...)", "type" },
{ "threads", HAS_ARG | OPT_EXPERT, {(void*)opt_thread_count}, "thread count", "count" },
projects / ffmpeg / blobdiff