initial

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2400 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 551 insertions, 0 deletions

diff --git a/ima4.c b/ima4.c
new file mode 100644
index 0000000000..ee964ac9dc
--- /dev/null
+++ b/ima4.c
@@ -0,0 +1,551 @@
+/*
+ IMA4:1 audio codec from QuickTime4Linux library. (http://www.heroinewarrior.com/)
+*/
+
+#include "ima4.h"
+
+static int quicktime_ima4_step[89] = 
+{
+    7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
+    19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
+    50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
+    130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
+    337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
+    876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
+    2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
+    5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
+    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
+};
+
+static int quicktime_ima4_index[16] = 
+{
+    -1, -1, -1, -1, 2, 4, 6, 8,
+    -1, -1, -1, -1, 2, 4, 6, 8
+};
+
+/* Known by divine revelation */
+
+#define BLOCK_SIZE 0x22
+#define SAMPLES_PER_BLOCK 0x40
+
+/* ================================== private for ima4 */
+
+
+void ima4_decode_sample(int *predictor, int *nibble, int *index, int *step)
+{
+	int difference, sign;
+
+/* Get new index value */
+	*index += quicktime_ima4_index[*nibble];
+
+	if(*index < 0) *index = 0; 
+	else 
+	if(*index > 88) *index = 88;
+
+/* Get sign and magnitude from *nibble */
+	sign = *nibble & 8;
+	*nibble = *nibble & 7;
+
+/* Get difference */
+	difference = *step >> 3;
+	if(*nibble & 4) difference += *step;
+	if(*nibble & 2) difference += *step >> 1;
+	if(*nibble & 1) difference += *step >> 2;
+
+/* Predict value */
+	if(sign) 
+	*predictor -= difference;
+	else 
+	*predictor += difference;
+
+	if(*predictor > 32767) *predictor = 32767;
+	else
+	if(*predictor < -32768) *predictor = -32768;
+
+/* Update the step value */
+	*step = quicktime_ima4_step[*index];
+}
+
+int ima4_decode_block(int16_t *output, unsigned char *input, int maxlen)
+{
+	int predictor;
+	int index;
+	int step;
+	int i, nibble, nibble_count, block_size;
+	int olen = 0;
+	unsigned char *block_ptr;
+	unsigned char *input_end = input + BLOCK_SIZE;
+//	quicktime_ima4_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
+
+/* Get the chunk header */
+	predictor = *input++ << 8;
+	predictor |= *input++;
+
+	index = predictor & 0x7f;
+	if(index > 88) index = 88;
+
+	predictor &= 0xff80;
+	if(predictor & 0x8000) predictor -= 0x10000;
+	step = quicktime_ima4_step[index];
+
+/* Read the input buffer sequentially, one nibble at a time */
+	nibble_count = 0;
+	while(input < input_end)
+	{
+		nibble = nibble_count ? (*input++  >> 4) & 0x0f : *input & 0x0f;
+
+		ima4_decode_sample(&predictor, &nibble, &index, &step);
+		if (olen+1 > maxlen)
+		    break;
+		*output++ = predictor;
+		olen++;
+
+		nibble_count ^= 1;
+	}
+	return(olen);
+}
+
+#if 0
+void ima4_encode_sample(int *last_sample, int *last_index, int *nibble, int next_sample)
+{
+	int difference, new_difference, mask, step;
+
+	difference = next_sample - *last_sample;
+	*nibble = 0;
+	step = quicktime_ima4_step[*last_index];
+	new_difference = step >> 3;
+
+	if(difference < 0)
+	{
+		*nibble = 8;
+		difference = -difference;
+	}
+
+	mask = 4;
+	while(mask)
+	{
+		if(difference >= step)
+		{
+			*nibble |= mask;
+			difference -= step;
+			new_difference += step;
+		}
+
+		step >>= 1;
+		mask >>= 1;
+	}
+
+	if(*nibble & 8)
+		*last_sample -= new_difference;
+	else
+		*last_sample += new_difference;
+
+	if(*last_sample > 32767) *last_sample = 32767;
+	else
+	if(*last_sample < -32767) *last_sample = -32767;
+
+	*last_index += quicktime_ima4_index[*nibble];
+
+	if(*last_index < 0) *last_index = 0;
+	else
+	if(*last_index > 88) *last_index= 88;
+}
+
+#if 0
+void ima4_encode_block(quicktime_audio_map_t *atrack, unsigned char *output, int16_t *input, int step, int channel)
+{
+	quicktime_ima4_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
+	int i, nibble_count = 0, nibble, header;
+
+/* Get a fake starting sample */
+	header = codec->last_samples[channel];
+/* Force rounding. */
+	if(header < 0x7fc0) header += 0x40;
+	if(header < 0) header += 0x10000;
+	header &= 0xff80;
+	*output++ = (header & 0xff00) >> 8;
+	*output++ = (header & 0x80) + (codec->last_indexes[channel] & 0x7f);
+
+	for(i = 0; i < SAMPLES_PER_BLOCK; i++)
+	{
+		ima4_encode_sample(&(codec->last_samples[channel]), 
+							&(codec->last_indexes[channel]), 
+							&nibble, 
+							*input);
+
+		if(nibble_count)
+			*output++ |= (nibble << 4);
+		else
+			*output = nibble;
+
+		input += step;
+		nibble_count ^= 1;
+	}
+}
+#endif
+/* Convert the number of samples in a chunk into the number of bytes in that */
+/* chunk.  The number of samples in a chunk should end on a block boundary. */
+long ima4_samples_to_bytes(long samples, int channels)
+{
+	long bytes = samples / SAMPLES_PER_BLOCK * BLOCK_SIZE * channels;
+	return bytes;
+}
+
+/* Decode the chunk into the work buffer */
+int ima4_decode_chunk(quicktime_t *file, int track, long chunk, int channel)
+{
+	int result = 0;
+	int i, j;
+	long chunk_samples, chunk_bytes;
+	unsigned char *chunk_ptr, *block_ptr;
+	quicktime_trak_t *trak = file->atracks[track].track;
+	quicktime_ima4_codec_t *codec = ((quicktime_codec_t*)file->atracks[track].codec)->priv;
+
+/* Get the byte count to read. */
+	chunk_samples = quicktime_chunk_samples(trak, chunk);
+	chunk_bytes = ima4_samples_to_bytes(chunk_samples, file->atracks[track].channels);
+
+/* Get the buffer to read into. */
+	if(codec->work_buffer && codec->work_size < chunk_samples)
+	{
+		free(codec->work_buffer);
+		codec->work_buffer = 0;
+	}
+
+	if(!codec->work_buffer)
+	{
+		codec->work_size = chunk_samples;
+		codec->work_buffer = malloc(sizeof(int16_t) * codec->work_size);
+	}
+
+	if(codec->read_buffer && codec->read_size < chunk_bytes)
+	{
+		free(codec->read_buffer);
+		codec->read_buffer = 0;
+	}
+
+	if(!codec->read_buffer)
+	{
+		codec->read_size = chunk_bytes;
+		codec->read_buffer = malloc(codec->read_size);
+	}
+
+/* codec->work_size now holds the number of samples in the last chunk */
+/* codec->read_size now holds number of bytes in the last read buffer */
+
+/* Read the entire chunk regardless of where the desired sample range starts. */
+	result = quicktime_read_chunk(file, codec->read_buffer, track, chunk, 0, chunk_bytes);
+
+/* Now decode the chunk, one block at a time, until the total samples in the chunk */
+/* is reached. */
+
+	if(!result)
+	{
+		block_ptr = codec->read_buffer;
+		for(i = 0; i < chunk_samples; i += SAMPLES_PER_BLOCK)
+		{
+			for(j = 0; j < file->atracks[track].channels; j++)
+			{
+				if(j == channel)
+					ima4_decode_block(&(file->atracks[track]), &(codec->work_buffer[i]), block_ptr);
+
+				block_ptr += BLOCK_SIZE;
+			}
+		}
+	}
+	codec->buffer_channel = channel;
+	codec->chunk = chunk;
+
+	return result;
+}
+
+
+/* =================================== public for ima4 */
+
+static int quicktime_delete_codec_ima4(quicktime_audio_map_t *atrack)
+{
+	quicktime_ima4_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
+
+	if(codec->work_buffer) free(codec->work_buffer);
+	if(codec->read_buffer) free(codec->read_buffer);
+	if(codec->last_samples) free(codec->last_samples);
+	if(codec->last_indexes) free(codec->last_indexes);
+	codec->last_samples = 0;
+	codec->last_indexes = 0;
+	codec->read_buffer = 0;
+	codec->work_buffer = 0;
+	codec->chunk = 0;
+	codec->buffer_channel = 0; /* Channel of work buffer */
+	codec->work_size = 0;          /* Size of work buffer */
+	codec->read_size = 0;
+	free(codec);
+	return 0;
+}
+
+static int quicktime_decode_ima4(quicktime_t *file, 
+					int16_t *output_i, 
+					float *output_f,
+					long samples, 
+					int track, 
+					int channel)
+{
+	int result = 0;
+	longest chunk, chunk_sample, chunk_bytes, chunk_samples;
+	longest i, chunk_start, chunk_end;
+	quicktime_trak_t *trak = file->atracks[track].track;
+	quicktime_ima4_codec_t *codec = ((quicktime_codec_t*)file->atracks[track].codec)->priv;
+
+/* Get the first chunk with this routine and then increase the chunk number. */
+	quicktime_chunk_of_sample(&chunk_sample, &chunk, trak, file->atracks[track].current_position);
+
+/* Read chunks and extract ranges of samples until the output is full. */
+	for(i = 0; i < samples && !result; )
+	{
+/* Get chunk we're on. */
+		chunk_samples = quicktime_chunk_samples(trak, chunk);
+
+		if(!codec->work_buffer ||
+			codec->chunk != chunk ||
+			codec->buffer_channel != channel)
+		{
+/* read a new chunk if necessary */
+			result = ima4_decode_chunk(file, track, chunk, channel);
+		}
+
+/* Get boundaries from the chunk */
+		chunk_start = 0;
+		if(chunk_sample < file->atracks[track].current_position)
+			chunk_start = file->atracks[track].current_position - chunk_sample;
+
+		chunk_end = chunk_samples;
+		if(chunk_sample + chunk_end > file->atracks[track].current_position + samples)
+			chunk_end = file->atracks[track].current_position + samples - chunk_sample;
+
+/* Read from the chunk */
+		if(output_i)
+		{
+/*printf("decode_ima4 1 chunk %ld %ld-%ld output %ld\n", chunk, chunk_start + chunk_sample, chunk_end + chunk_sample, i); */
+			while(chunk_start < chunk_end)
+			{
+				output_i[i++] = codec->work_buffer[chunk_start++];
+			}
+/*printf("decode_ima4 2\n"); */
+		}
+		else
+		if(output_f)
+		{
+			while(chunk_start < chunk_end)
+			{
+				output_f[i++] = (float)codec->work_buffer[chunk_start++] / 32767;
+			}
+		}
+
+		chunk++;
+		chunk_sample += chunk_samples;
+	}
+
+	return result;
+}
+
+static int quicktime_encode_ima4(quicktime_t *file, 
+						int16_t **input_i, 
+						float **input_f, 
+						int track, 
+						long samples)
+{
+	int result = 0;
+	longest i, j, step;
+	longest chunk_bytes;
+	longest overflow_start;
+	longest offset;
+	longest chunk_samples; /* Samples in the current chunk to be written */
+	quicktime_audio_map_t *track_map = &(file->atracks[track]);
+	quicktime_ima4_codec_t *codec = ((quicktime_codec_t*)track_map->codec)->priv;
+	int16_t *input_ptr;
+	unsigned char *output_ptr;
+
+/* Get buffer sizes */
+	if(codec->work_buffer && codec->work_size < (samples + codec->work_overflow + 1) * track_map->channels)
+	{
+/* Create new buffer */
+		longest new_size = (samples + codec->work_overflow + 1) * track_map->channels;
+		int16_t *new_buffer = malloc(sizeof(int16_t) * new_size);
+
+/* Copy overflow */
+		for(i = 0; i < codec->work_overflow * track_map->channels; i++)
+			new_buffer[i] = codec->work_buffer[i];
+
+/* Swap pointers. */
+		free(codec->work_buffer);
+		codec->work_buffer = new_buffer;
+		codec->work_size = new_size;
+	}
+	else
+	if(!codec->work_buffer)
+	{
+/* No buffer in the first place. */
+		codec->work_size = (samples + codec->work_overflow) * track_map->channels;
+/* Make the allocation enough for at least the flush routine. */
+		if(codec->work_size < SAMPLES_PER_BLOCK * track_map->channels)
+			codec->work_size = SAMPLES_PER_BLOCK * track_map->channels;
+		codec->work_buffer = malloc(sizeof(int16_t) * codec->work_size);
+	}
+
+/* Get output size */
+	chunk_bytes = ima4_samples_to_bytes(samples + codec->work_overflow, track_map->channels);
+	if(codec->read_buffer && codec->read_size < chunk_bytes)
+	{
+		free(codec->read_buffer);
+		codec->read_buffer = 0;
+	}
+
+	if(!codec->read_buffer)
+	{
+		codec->read_buffer = malloc(chunk_bytes);
+		codec->read_size = chunk_bytes;
+	}
+
+	if(!codec->last_samples)
+	{
+		codec->last_samples = malloc(sizeof(int) * track_map->channels);
+		for(i = 0; i < track_map->channels; i++)
+		{
+			codec->last_samples[i] = 0;
+		}
+	}
+
+	if(!codec->last_indexes)
+	{
+		codec->last_indexes = malloc(sizeof(int) * track_map->channels);
+		for(i = 0; i < track_map->channels; i++)
+		{
+			codec->last_indexes[i] = 0;
+		}
+	}
+
+/* Arm the input buffer after the last overflow */
+	step = track_map->channels;
+	for(j = 0; j < track_map->channels; j++)
+	{
+		input_ptr = codec->work_buffer + codec->work_overflow * track_map->channels + j;
+
+		if(input_i)
+		{
+			for(i = 0; i < samples; i++)
+			{
+				*input_ptr = input_i[j][i];
+				input_ptr += step;
+			}
+		}
+		else
+		if(input_f)
+		{
+			for(i = 0; i < samples; i++)
+			{
+				*input_ptr = (int16_t)(input_f[j][i] * 32767);
+				input_ptr += step;
+			}
+		}
+	}
+
+/* Encode from the input buffer to the read_buffer up to a multiple of  */
+/* blocks. */
+	input_ptr = codec->work_buffer;
+	output_ptr = codec->read_buffer;
+
+	for(i = 0; 
+		i + SAMPLES_PER_BLOCK <= samples + codec->work_overflow; 
+		i += SAMPLES_PER_BLOCK)
+	{
+		for(j = 0; j < track_map->channels; j++)
+		{
+			ima4_encode_block(track_map, output_ptr, input_ptr + j, track_map->channels, j);
+
+			output_ptr += BLOCK_SIZE;
+		}
+		input_ptr += SAMPLES_PER_BLOCK * track_map->channels;
+	}
+
+/* Write to disk */
+	chunk_samples = (longest)((samples + codec->work_overflow) / SAMPLES_PER_BLOCK) * SAMPLES_PER_BLOCK;
+
+/*printf("quicktime_encode_ima4 1 %ld\n", chunk_samples); */
+/* The block division may result in 0 samples getting encoded. */
+/* Don't write 0 samples. */
+	if(chunk_samples)
+	{
+		offset = quicktime_position(file);
+		result = quicktime_write_data(file, codec->read_buffer, chunk_bytes);
+		if(result) result = 0; else result = 1; /* defeat fwrite's return */
+		quicktime_update_tables(file,
+							track_map->track, 
+							offset, 
+							track_map->current_chunk, 
+							track_map->current_position, 
+							chunk_samples, 
+							0);
+		file->atracks[track].current_chunk++;
+	}
+
+/* Move the last overflow to the front */
+	overflow_start = i;
+	input_ptr = codec->work_buffer;
+	for(i = overflow_start * track_map->channels ; 
+		i < (samples + codec->work_overflow) * track_map->channels; 
+		i++)
+	{
+		*input_ptr++ = codec->work_buffer[i];
+	}
+	codec->work_overflow = samples + codec->work_overflow - overflow_start;
+
+	return result;
+}
+
+int quicktime_flush_ima4(quicktime_t *file, int track)
+{
+	quicktime_audio_map_t *track_map = &(file->atracks[track]);
+	quicktime_ima4_codec_t *codec = ((quicktime_codec_t*)track_map->codec)->priv;
+	int result = 0;
+	int i;
+
+/*printf("quicktime_flush_ima4 %ld\n", codec->work_overflow); */
+	if(codec->work_overflow)
+	{
+/* Zero out enough to get a block */
+		i = codec->work_overflow * track_map->channels;
+		while(i < SAMPLES_PER_BLOCK * track_map->channels)
+		{
+			codec->work_buffer[i++] = 0;
+		}
+		codec->work_overflow = i / track_map->channels + 1;
+/* Write the work_overflow only. */
+		result = quicktime_encode_ima4(file, 0, 0, track, 0);
+	}
+	return result;
+}
+
+void quicktime_init_codec_ima4(quicktime_audio_map_t *atrack)
+{
+	quicktime_ima4_codec_t *codec;
+
+/* Init public items */
+	((quicktime_codec_t*)atrack->codec)->priv = calloc(1, sizeof(quicktime_ima4_codec_t));
+	((quicktime_codec_t*)atrack->codec)->delete_acodec = quicktime_delete_codec_ima4;
+	((quicktime_codec_t*)atrack->codec)->decode_video = 0;
+	((quicktime_codec_t*)atrack->codec)->encode_video = 0;
+	((quicktime_codec_t*)atrack->codec)->decode_audio = quicktime_decode_ima4;
+	((quicktime_codec_t*)atrack->codec)->encode_audio = quicktime_encode_ima4;
+
+/* Init private items */
+	codec = ((quicktime_codec_t*)atrack->codec)->priv;
+	codec->work_buffer = 0;
+	codec->read_buffer = 0;
+	codec->chunk = 0;
+	codec->buffer_channel = 0;
+	codec->work_overflow = 0;
+	codec->work_size = 0;
+	codec->read_size = 0;
+	codec->last_samples = 0;
+	codec->last_indexes = 0;
+}
+#endif