mirror of https://git.ffmpeg.org/ffmpeg.git
replace custom bit-reading functions with FFmpeg's internal function;
roll alac_file data structure members into ALACContext Originally committed as revision 4027 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson
parent
42ebf67d89
commit
6d021b00e2
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@ -36,21 +36,22 @@
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#include "avcodec.h"
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#include "bitstream.h"
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#define ALAC_EXTRADATA_SIZE 36
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struct alac_file {
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unsigned char *input_buffer;
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int input_buffer_index;
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int input_buffer_size;
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int input_buffer_bitaccumulator; /* used so we can do arbitary
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bit reads */
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typedef struct {
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AVCodecContext *avctx;
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GetBitContext gb;
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/* init to 0; first frame decode should initialize from extradata and
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* set this to 1 */
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int context_initialized;
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int samplesize;
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int numchannels;
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int bytespersample;
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/* buffers */
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int32_t *predicterror_buffer_a;
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int32_t *predicterror_buffer_b;
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@ -58,7 +59,6 @@ struct alac_file {
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int32_t *outputsamples_buffer_a;
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int32_t *outputsamples_buffer_b;
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/* stuff from setinfo */
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uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */ /* max samples per frame? */
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uint8_t setinfo_7a; /* 0x00 */
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@ -72,21 +72,10 @@ struct alac_file {
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uint32_t setinfo_86; /* 0x00069fe4 */
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uint32_t setinfo_8a_rate; /* 0x0000ac44 */
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/* end setinfo stuff */
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};
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typedef struct alac_file alac_file;
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typedef struct {
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AVCodecContext *avctx;
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/* init to 0; first frame decode should initialize from extradata and
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* set this to 1 */
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int context_initialized;
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alac_file *alac;
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} ALACContext;
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static void allocate_buffers(alac_file *alac)
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static void allocate_buffers(ALACContext *alac)
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{
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alac->predicterror_buffer_a = av_malloc(alac->setinfo_max_samples_per_frame * 4);
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alac->predicterror_buffer_b = av_malloc(alac->setinfo_max_samples_per_frame * 4);
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@ -95,9 +84,9 @@ static void allocate_buffers(alac_file *alac)
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alac->outputsamples_buffer_b = av_malloc(alac->setinfo_max_samples_per_frame * 4);
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}
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void alac_set_info(alac_file *alac, char *inputbuffer)
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void alac_set_info(ALACContext *alac)
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{
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unsigned char *ptr = inputbuffer;
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unsigned char *ptr = alac->avctx->extradata;
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ptr += 4; /* size */
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ptr += 4; /* alac */
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@ -123,96 +112,6 @@ void alac_set_info(alac_file *alac, char *inputbuffer)
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allocate_buffers(alac);
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}
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/* stream reading */
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/* supports reading 1 to 16 bits, in big endian format */
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static uint32_t readbits_16(alac_file *alac, int bits)
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{
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uint32_t result;
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int new_accumulator;
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if (alac->input_buffer_index + 2 >= alac->input_buffer_size) {
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av_log(NULL, AV_LOG_ERROR, "alac: input buffer went out of bounds (%d >= %d)\n",
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alac->input_buffer_index + 2, alac->input_buffer_size);
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}
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result = (alac->input_buffer[alac->input_buffer_index + 0] << 16) |
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(alac->input_buffer[alac->input_buffer_index + 1] << 8) |
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(alac->input_buffer[alac->input_buffer_index + 2]);
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/* shift left by the number of bits we've already read,
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* so that the top 'n' bits of the 24 bits we read will
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* be the return bits */
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result = result << alac->input_buffer_bitaccumulator;
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result = result & 0x00ffffff;
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/* and then only want the top 'n' bits from that, where
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* n is 'bits' */
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result = result >> (24 - bits);
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new_accumulator = (alac->input_buffer_bitaccumulator + bits);
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/* increase the buffer pointer if we've read over n bytes. */
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alac->input_buffer_index += (new_accumulator >> 3);
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/* and the remainder goes back into the bit accumulator */
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alac->input_buffer_bitaccumulator = (new_accumulator & 7);
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return result;
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}
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/* supports reading 1 to 32 bits, in big endian format */
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static uint32_t readbits(alac_file *alac, int bits)
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{
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int32_t result = 0;
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if (bits > 16) {
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bits -= 16;
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result = readbits_16(alac, 16) << bits;
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}
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result |= readbits_16(alac, bits);
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return result;
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}
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/* reads a single bit */
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static int readbit(alac_file *alac)
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{
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int result;
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int new_accumulator;
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if (alac->input_buffer_index >= alac->input_buffer_size) {
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av_log(NULL, AV_LOG_ERROR, "alac: input buffer went out of bounds (%d >= %d)\n",
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alac->input_buffer_index + 2, alac->input_buffer_size);
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}
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result = alac->input_buffer[alac->input_buffer_index];
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result = result << alac->input_buffer_bitaccumulator;
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result = result >> 7 & 1;
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new_accumulator = (alac->input_buffer_bitaccumulator + 1);
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alac->input_buffer_index += (new_accumulator / 8);
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alac->input_buffer_bitaccumulator = (new_accumulator % 8);
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return result;
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}
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static void unreadbits(alac_file *alac, int bits)
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{
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int new_accumulator = (alac->input_buffer_bitaccumulator - bits);
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alac->input_buffer_index += (new_accumulator >> 3);
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alac->input_buffer_bitaccumulator = (new_accumulator & 7);
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if (alac->input_buffer_bitaccumulator < 0)
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alac->input_buffer_bitaccumulator *= -1;
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}
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/* hideously inefficient. could use a bitmask search,
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* alternatively bsr on x86,
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*/
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@ -226,7 +125,7 @@ static int count_leading_zeros(int32_t input)
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return i;
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}
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void bastardized_rice_decompress(alac_file *alac,
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void bastardized_rice_decompress(ALACContext *alac,
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int32_t *output_buffer,
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int output_size,
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int readsamplesize, /* arg_10 */
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@ -246,7 +145,7 @@ void bastardized_rice_decompress(alac_file *alac,
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int32_t final_val;
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/* read x - number of 1s before 0 represent the rice */
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while (x <= 8 && readbit(alac)) {
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while (x <= 8 && get_bits1(&alac->gb)) {
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x++;
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}
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@ -255,7 +154,7 @@ void bastardized_rice_decompress(alac_file *alac,
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/* use alternative encoding */
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int32_t value;
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value = readbits(alac, readsamplesize);
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value = get_bits(&alac->gb, readsamplesize);
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/* mask value to readsamplesize size */
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if (readsamplesize != 32)
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@ -276,15 +175,17 @@ void bastardized_rice_decompress(alac_file *alac,
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k = rice_kmodifier;
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if (k != 1) {
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extrabits = readbits(alac, k);
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extrabits = show_bits(&alac->gb, k);
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/* multiply x by 2^k - 1, as part of their strange algorithm */
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x = (x << k) - x;
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if (extrabits > 1) {
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x += extrabits - 1;
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} else
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unreadbits(alac, 1);
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get_bits(&alac->gb, k);
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} else {
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get_bits(&alac->gb, k - 1);
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}
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}
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}
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@ -310,12 +211,12 @@ void bastardized_rice_decompress(alac_file *alac,
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sign_modifier = 1;
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x = 0;
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while (x <= 8 && readbit(alac)) {
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while (x <= 8 && get_bits1(&alac->gb)) {
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x++;
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}
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if (x > 8) {
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block_size = readbits(alac, 16);
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block_size = get_bits(&alac->gb, 16);
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block_size &= 0xffff;
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} else {
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int k;
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@ -323,7 +224,7 @@ void bastardized_rice_decompress(alac_file *alac,
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k = count_leading_zeros(history) + ((history + 16) >> 6 /* / 64 */) - 24;
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extrabits = readbits(alac, k);
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extrabits = show_bits(&alac->gb, k);
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block_size = (((1 << k) - 1) & rice_kmodifier_mask) * x
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+ extrabits - 1;
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@ -331,7 +232,9 @@ void bastardized_rice_decompress(alac_file *alac,
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if (extrabits < 2) {
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x = 1 - extrabits;
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block_size += x;
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unreadbits(alac, 1);
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get_bits(&alac->gb, k - 1);
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} else {
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get_bits(&alac->gb, k);
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}
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}
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@ -529,8 +432,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
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void *outbuffer, int *outputsize,
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uint8_t *inbuffer, int input_buffer_size)
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{
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ALACContext *s = avctx->priv_data;
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alac_file *alac = s->alac;
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ALACContext *alac = avctx->priv_data;
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int channels;
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int32_t outputsamples;
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@ -540,25 +442,21 @@ static int alac_decode_frame(AVCodecContext *avctx,
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return input_buffer_size;
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/* initialize from the extradata */
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if (!s->context_initialized) {
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if (s->avctx->extradata_size != ALAC_EXTRADATA_SIZE) {
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if (!alac->context_initialized) {
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if (alac->avctx->extradata_size != ALAC_EXTRADATA_SIZE) {
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av_log(NULL, AV_LOG_ERROR, "alac: expected %d extradata bytes\n",
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ALAC_EXTRADATA_SIZE);
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return input_buffer_size;
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}
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alac_set_info(s->alac, s->avctx->extradata);
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s->context_initialized = 1;
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alac_set_info(alac);
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alac->context_initialized = 1;
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}
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outputsamples = alac->setinfo_max_samples_per_frame;
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/* setup the stream */
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alac->input_buffer = inbuffer;
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alac->input_buffer_index = 0;
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alac->input_buffer_size = input_buffer_size;
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alac->input_buffer_bitaccumulator = 0;
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init_get_bits(&alac->gb, inbuffer, input_buffer_size * 8);
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channels = readbits(alac, 3);
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channels = get_bits(&alac->gb, 3);
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*outputsize = outputsamples * alac->bytespersample;
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@ -575,20 +473,20 @@ static int alac_decode_frame(AVCodecContext *avctx,
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/* 2^result = something to do with output waiting.
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* perhaps matters if we read > 1 frame in a pass?
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*/
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readbits(alac, 4);
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get_bits(&alac->gb, 4);
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readbits(alac, 12); /* unknown, skip 12 bits */
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get_bits(&alac->gb, 12); /* unknown, skip 12 bits */
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hassize = readbits(alac, 1); /* the output sample size is stored soon */
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hassize = get_bits(&alac->gb, 1); /* the output sample size is stored soon */
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wasted_bytes = readbits(alac, 2); /* unknown ? */
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wasted_bytes = get_bits(&alac->gb, 2); /* unknown ? */
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isnotcompressed = readbits(alac, 1); /* whether the frame is compressed */
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isnotcompressed = get_bits(&alac->gb, 1); /* whether the frame is compressed */
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if (hassize) {
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/* now read the number of samples,
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* as a 32bit integer */
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outputsamples = readbits(alac, 32);
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outputsamples = get_bits(&alac->gb, 32);
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*outputsize = outputsamples * alac->bytespersample;
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}
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@ -604,18 +502,18 @@ static int alac_decode_frame(AVCodecContext *avctx,
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/* skip 16 bits, not sure what they are. seem to be used in
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* two channel case */
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readbits(alac, 8);
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readbits(alac, 8);
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get_bits(&alac->gb, 8);
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get_bits(&alac->gb, 8);
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prediction_type = readbits(alac, 4);
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prediction_quantitization = readbits(alac, 4);
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prediction_type = get_bits(&alac->gb, 4);
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prediction_quantitization = get_bits(&alac->gb, 4);
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ricemodifier = readbits(alac, 3);
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predictor_coef_num = readbits(alac, 5);
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ricemodifier = get_bits(&alac->gb, 3);
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predictor_coef_num = get_bits(&alac->gb, 5);
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/* read the predictor table */
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for (i = 0; i < predictor_coef_num; i++) {
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predictor_coef_table[i] = (int16_t)readbits(alac, 16);
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predictor_coef_table[i] = (int16_t)get_bits(&alac->gb, 16);
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}
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if (wasted_bytes) {
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@ -658,7 +556,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
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if (readsamplesize <= 16) {
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int i;
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for (i = 0; i < outputsamples; i++) {
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int32_t audiobits = readbits(alac, readsamplesize);
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int32_t audiobits = get_bits(&alac->gb, readsamplesize);
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audiobits = SIGN_EXTENDED32(audiobits, readsamplesize);
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@ -669,13 +567,13 @@ static int alac_decode_frame(AVCodecContext *avctx,
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for (i = 0; i < outputsamples; i++) {
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int32_t audiobits;
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audiobits = readbits(alac, 16);
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audiobits = get_bits(&alac->gb, 16);
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/* special case of sign extension..
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* as we'll be ORing the low 16bits into this */
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audiobits = audiobits << 16;
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audiobits = audiobits >> (32 - readsamplesize);
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audiobits |= readbits(alac, readsamplesize - 16);
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audiobits |= get_bits(&alac->gb, readsamplesize - 16);
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alac->outputsamples_buffer_a[i] = audiobits;
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}
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@ -716,20 +614,20 @@ static int alac_decode_frame(AVCodecContext *avctx,
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/* 2^result = something to do with output waiting.
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* perhaps matters if we read > 1 frame in a pass?
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*/
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readbits(alac, 4);
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get_bits(&alac->gb, 4);
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readbits(alac, 12); /* unknown, skip 12 bits */
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get_bits(&alac->gb, 12); /* unknown, skip 12 bits */
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hassize = readbits(alac, 1); /* the output sample size is stored soon */
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hassize = get_bits(&alac->gb, 1); /* the output sample size is stored soon */
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wasted_bytes = readbits(alac, 2); /* unknown ? */
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wasted_bytes = get_bits(&alac->gb, 2); /* unknown ? */
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isnotcompressed = readbits(alac, 1); /* whether the frame is compressed */
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isnotcompressed = get_bits(&alac->gb, 1); /* whether the frame is compressed */
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if (hassize) {
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/* now read the number of samples,
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* as a 32bit integer */
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outputsamples = readbits(alac, 32);
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outputsamples = get_bits(&alac->gb, 32);
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*outputsize = outputsamples * alac->bytespersample;
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}
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@ -751,31 +649,31 @@ static int alac_decode_frame(AVCodecContext *avctx,
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int i;
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interlacing_shift = readbits(alac, 8);
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interlacing_leftweight = readbits(alac, 8);
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interlacing_shift = get_bits(&alac->gb, 8);
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interlacing_leftweight = get_bits(&alac->gb, 8);
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/******** channel 1 ***********/
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prediction_type_a = readbits(alac, 4);
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prediction_quantitization_a = readbits(alac, 4);
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prediction_type_a = get_bits(&alac->gb, 4);
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prediction_quantitization_a = get_bits(&alac->gb, 4);
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ricemodifier_a = readbits(alac, 3);
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predictor_coef_num_a = readbits(alac, 5);
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ricemodifier_a = get_bits(&alac->gb, 3);
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predictor_coef_num_a = get_bits(&alac->gb, 5);
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/* read the predictor table */
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for (i = 0; i < predictor_coef_num_a; i++) {
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predictor_coef_table_a[i] = (int16_t)readbits(alac, 16);
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predictor_coef_table_a[i] = (int16_t)get_bits(&alac->gb, 16);
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}
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/******** channel 2 *********/
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prediction_type_b = readbits(alac, 4);
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prediction_quantitization_b = readbits(alac, 4);
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prediction_type_b = get_bits(&alac->gb, 4);
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prediction_quantitization_b = get_bits(&alac->gb, 4);
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ricemodifier_b = readbits(alac, 3);
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predictor_coef_num_b = readbits(alac, 5);
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ricemodifier_b = get_bits(&alac->gb, 3);
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predictor_coef_num_b = get_bits(&alac->gb, 5);
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||||
|
||||
/* read the predictor table */
|
||||
for (i = 0; i < predictor_coef_num_b; i++) {
|
||||
predictor_coef_table_b[i] = (int16_t)readbits(alac, 16);
|
||||
predictor_coef_table_b[i] = (int16_t)get_bits(&alac->gb, 16);
|
||||
}
|
||||
|
||||
/*********************/
|
||||
|
|
@ -837,8 +735,8 @@ static int alac_decode_frame(AVCodecContext *avctx,
|
|||
for (i = 0; i < outputsamples; i++) {
|
||||
int32_t audiobits_a, audiobits_b;
|
||||
|
||||
audiobits_a = readbits(alac, alac->setinfo_sample_size);
|
||||
audiobits_b = readbits(alac, alac->setinfo_sample_size);
|
||||
audiobits_a = get_bits(&alac->gb, alac->setinfo_sample_size);
|
||||
audiobits_b = get_bits(&alac->gb, alac->setinfo_sample_size);
|
||||
|
||||
audiobits_a = SIGN_EXTENDED32(audiobits_a, alac->setinfo_sample_size);
|
||||
audiobits_b = SIGN_EXTENDED32(audiobits_b, alac->setinfo_sample_size);
|
||||
|
|
@ -851,15 +749,15 @@ static int alac_decode_frame(AVCodecContext *avctx,
|
|||
for (i = 0; i < outputsamples; i++) {
|
||||
int32_t audiobits_a, audiobits_b;
|
||||
|
||||
audiobits_a = readbits(alac, 16);
|
||||
audiobits_a = get_bits(&alac->gb, 16);
|
||||
audiobits_a = audiobits_a << 16;
|
||||
audiobits_a = audiobits_a >> (32 - alac->setinfo_sample_size);
|
||||
audiobits_a |= readbits(alac, alac->setinfo_sample_size - 16);
|
||||
audiobits_a |= get_bits(&alac->gb, alac->setinfo_sample_size - 16);
|
||||
|
||||
audiobits_b = readbits(alac, 16);
|
||||
audiobits_b = get_bits(&alac->gb, 16);
|
||||
audiobits_b = audiobits_b << 16;
|
||||
audiobits_b = audiobits_b >> (32 - alac->setinfo_sample_size);
|
||||
audiobits_b |= readbits(alac, alac->setinfo_sample_size - 16);
|
||||
audiobits_b |= get_bits(&alac->gb, alac->setinfo_sample_size - 16);
|
||||
|
||||
alac->outputsamples_buffer_a[i] = audiobits_a;
|
||||
alac->outputsamples_buffer_b[i] = audiobits_b;
|
||||
|
|
@ -899,28 +797,26 @@ static int alac_decode_frame(AVCodecContext *avctx,
|
|||
|
||||
static int alac_decode_init(AVCodecContext * avctx)
|
||||
{
|
||||
ALACContext *s = avctx->priv_data;
|
||||
s->avctx = avctx;
|
||||
s->context_initialized = 0;
|
||||
ALACContext *alac = avctx->priv_data;
|
||||
alac->avctx = avctx;
|
||||
alac->context_initialized = 0;
|
||||
|
||||
s->alac = av_malloc(sizeof(alac_file));
|
||||
|
||||
s->alac->samplesize = s->avctx->bits_per_sample;
|
||||
s->alac->numchannels = s->avctx->channels;
|
||||
s->alac->bytespersample = (s->alac->samplesize / 8) * s->alac->numchannels;
|
||||
alac->samplesize = alac->avctx->bits_per_sample;
|
||||
alac->numchannels = alac->avctx->channels;
|
||||
alac->bytespersample = (alac->samplesize / 8) * alac->numchannels;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int alac_decode_close(AVCodecContext *avctx)
|
||||
{
|
||||
ALACContext *s = avctx->priv_data;
|
||||
ALACContext *alac = avctx->priv_data;
|
||||
|
||||
av_free(s->alac->predicterror_buffer_a);
|
||||
av_free(s->alac->predicterror_buffer_b);
|
||||
av_free(alac->predicterror_buffer_a);
|
||||
av_free(alac->predicterror_buffer_b);
|
||||
|
||||
av_free(s->alac->outputsamples_buffer_a);
|
||||
av_free(s->alac->outputsamples_buffer_b);
|
||||
av_free(alac->outputsamples_buffer_a);
|
||||
av_free(alac->outputsamples_buffer_b);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue