aac_afh: use the file mapping rather than read()
authorAndre Noll <maan@systemlinux.org>
Mon, 12 Mar 2007 21:33:34 +0000 (22:33 +0100)
committerAndre Noll <maan@systemlinux.org>
Mon, 12 Mar 2007 21:33:34 +0000 (22:33 +0100)
This simplifies this audio format handler quite a bit.

Also fix a bug in error.h: E_AAC_OVERRUN is an error of the aac decoder,
so move the corresponding define to where it belongs.

aac_afh.c
error.h

index f6b8698..17b7225 100644 (file)
--- a/aac_afh.c
+++ b/aac_afh.c
 #include "aac.h"
 #include "fd.h"
 
-/** size of the input buffer, must be big enough to hold header */
-#define AAC_INBUF_SIZE 65536
-
-static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
+static int aac_find_stsz(unsigned char *buf, off_t buflen, off_t *skip)
 {
        int i;
 
@@ -54,48 +51,32 @@ static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
                *skip = i;
                return sample_count;
        }
-       PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
        return -E_STSZ;
 }
 
-static int read_chunk_table(FILE *file, struct audio_format_info *afi,
-               unsigned char *inbuf, size_t inbuf_len, size_t skip)
+static ssize_t aac_compute_chunk_table(struct audio_format_info *afi,
+               unsigned char *map, off_t numbytes)
 {
        int ret, i;
        size_t sum = 0;
+       off_t skip;
 
-       for (;;) {
-               ret = aac_find_stsz(inbuf, inbuf_len, &skip);
-               if (ret >= 0)
-                       break;
-               ret = read(fileno(file), inbuf, AAC_INBUF_SIZE);
-               if (ret <= 0)
-                       return -E_AAC_READ;
-               inbuf_len = ret;
-               PARA_INFO_LOG("next buffer: %d bytes\n", ret);
-       }
+       ret = aac_find_stsz(map, numbytes, &skip);
+       if (ret < 0)
+               return ret;
        afi->chunks_total = ret;
        PARA_INFO_LOG("sz table has %lu entries\n", afi->chunks_total);
        afi->chunk_table = para_malloc((afi->chunks_total + 1) * sizeof(size_t));
        for (i = 1; i <= afi->chunks_total; i++) {
-               if (skip + 4 > inbuf_len) {
-                       skip = inbuf_len - skip;
-                       memmove(inbuf, inbuf + inbuf_len - skip, skip);
-                       ret = read(fileno(file), inbuf + skip,
-                               AAC_INBUF_SIZE - skip);
-                       if (ret <= 0)
-                               return -E_AAC_READ;
-                       inbuf_len = ret + skip;
-                       skip = 0;
-                       PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len);
-               }
-               sum += aac_read_int32(inbuf + skip);
+               if (skip + 4 > numbytes)
+                       break;
+               sum += aac_read_int32(map + skip);
                afi->chunk_table[i] = sum;
                skip += 4;
 //             if (i < 10 || i + 10 > afi->chunks_total)
 //                     PARA_DEBUG_LOG("offset #%d: %zu\n", i, afi->chunk_table[i]);
        }
-       return 1;
+       return skip;
 }
 
 static long unsigned aac_set_chunk_tv(struct audio_format_info *afi,
@@ -116,54 +97,37 @@ static long unsigned aac_set_chunk_tv(struct audio_format_info *afi,
 /*
  * Init m4a file and write some tech data to given pointers.
  */
-static int aac_get_file_info(FILE *file, char *map, off_t numbytes,
+static int aac_get_file_info(__a_unused FILE *file, char *map, off_t numbytes,
                struct audio_format_info *afi)
 {
-       int i, ret, decoder_len;
-       size_t inbuf_len, skip;
-       unsigned long rate = 0;
-       unsigned char channels = 0, *inbuf = para_malloc(AAC_INBUF_SIZE);
+       int i;
+       size_t skip;
+       ssize_t ret;
+       unsigned long rate = 0, decoder_len;
+       unsigned char channels = 0;
        mp4AudioSpecificConfig mp4ASC;
        NeAACDecHandle handle;
 
-       ret = read(fileno(file), inbuf, AAC_INBUF_SIZE);
-       if (ret <= 0) {
-               ret = -E_AAC_READ;
-               goto out;
-       }
-       inbuf_len = ret;
-       ret = aac_find_esds(inbuf, inbuf_len, &skip);
+       ret = aac_find_esds(map, numbytes, &skip);
        if (ret < 0)
                goto out;
        decoder_len = ret;
        handle = aac_open();
-       ret = NeAACDecInit(handle, inbuf + skip, decoder_len, &rate, &channels);
-       if (ret < 0) {
-               ret = -E_AACDEC_INIT;
+       ret = -E_AACDEC_INIT;
+       if (NeAACDecInit(handle, map + skip, decoder_len, &rate, &channels))
                goto out;
-       }
-       skip += ret;
        PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
        ret = -E_MP4ASC;
-       if (NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip,
-                       &mp4ASC) < 0)
+       if (NeAACDecAudioSpecificConfig(map + skip, numbytes - skip, &mp4ASC))
                goto out;
-       ret = read_chunk_table(file, afi, inbuf, inbuf_len, skip);
+       ret = aac_compute_chunk_table(afi, map, numbytes);
        if (ret < 0)
                goto out;
+       skip = ret;
        afi->seconds_total = aac_set_chunk_tv(afi, &mp4ASC);
-       for (;;) {
-               ret = aac_find_entry_point(inbuf, inbuf_len, &skip);
-               if (ret >= 0)
-                       break;
-               ret = read(fileno(file), inbuf, AAC_INBUF_SIZE);
-               if (ret <= 0) {
-                       ret = -E_AAC_READ;
-                       goto out;
-               }
-               inbuf_len = ret;
-               PARA_INFO_LOG("next buffer: %d bytes\n", ret);
-       }
+       ret = aac_find_entry_point(map + skip, numbytes - skip, &skip);
+       if (ret < 0)
+               goto out;
        afi->chunk_table[0] = ret;
        for (i = 1; i<= afi->chunks_total; i++)
                afi->chunk_table[i] += ret;
@@ -175,7 +139,6 @@ static int aac_get_file_info(FILE *file, char *map, off_t numbytes,
        tv_scale(20, &afi->chunk_tv, &afi->eof_tv);
        ret = 1;
 out:
-       free(inbuf);
        return ret;
 }
 
diff --git a/error.h b/error.h
index 45485e1..d8c9229 100644 (file)
--- a/error.h
+++ b/error.h
@@ -274,11 +274,8 @@ extern const char **para_errlist[];
 
 
 #define AAC_AFH_ERRORS \
-       PARA_ERROR(AAC_REPOS, "aac repositioning error"), \
-       PARA_ERROR(AAC_READ, "aac read error"), \
        PARA_ERROR(STSZ, "did not find stcz atom"), \
        PARA_ERROR(MP4ASC, "audio spec config error"), \
-       PARA_ERROR(AAC_OVERRUN, "aac output buffer overrun"), \
 
 
 #define AAC_COMMON_ERRORS \
@@ -447,6 +444,7 @@ extern const char **para_errlist[];
 #define AACDEC_ERRORS \
        PARA_ERROR(AACDEC_INIT, "failed to init aac decoder"), \
        PARA_ERROR(AAC_DECODE, "aac decode error"), \
+       PARA_ERROR(AAC_OVERRUN, "aac output buffer overrun"), \
 
 
 /**